I spend a lot of time backpacking and camping with my kids. If it weren’t for my dehydrator, this wouldn’t be possible. I simply wouldn’t be able to carry all the food.
Dehydrating means I can make my own just-add-water meals which are lightweight yet still tasty and nutritious.
My dehydrator also means I save a lot of money. I can buy foods like tomatoes and peppers when they are in season, dehydrate them, and have them all year round.
A lot of people get a dehydrator but never end up using it though. Or, maybe they occasionally dry some fruit leathers and veggies.
In this guide, I want to go over some expert-level food dehydrating principles and tactics. Hopefully they will give you the info you need to start using your dehydrator to its full potential.
Recommended Reading: Best Food Dehydrators Reviewed
Some Notes before We Begin:
- Type of dehydrator: This guide is written for people using an electric dehydrator. You could certainly also use sun drying, solar dehydrators, or even your oven. Most of the principles stay the same.
- Drying times: Most dehydrating guides will give you a chart of drying times. I’m not going to do that because it can vary drastically. Depending on your dehydrator’s strength, how well the dehydrator circulates air, and the juiciness of the food, it could take several hours more or less. Consult with your dehydrator manual if you really need a chart of drying times.
- Experiment! Most of what I’ve learned about dehydrating has come from experimenting. Don’t be afraid to try your own recipes.
- 1 Fruits
- 2 Veggies
- 3 Starches
- 4 Meat
- 5 Other Proteins
- 6 Making Dehydrated Meals
- 7 Storing Dehydrated Foods
- 8 Common Dehydrating Mistakes
- 8.1 1. Buying the wrong dehydrator:
- 8.2 2. Relying on drying guidelines to determine when a food is “done”:
- 8.3 3. Dehydrating different foods at the same time:
- 8.4 4. Stopping dehydrating in the middle:
- 8.5 5. Not testing dehydrated meals before packaging:
- 8.6 6. Not allowing enough time for rehydrating:
- 8.7 7. Drying oily or fatty foods:
- 8.8 8. Not killing pests before dehydrating:
- 8.9 9. Improper storage:
Fruits are very easy to dehydrate and get the best results. You can snack on them immediately after drying or use them to make cakes, pies, or energy balls (which is a heck of a lot cheaper than buying energy bars at the store).
1. Preparing Fruit for Dehydrating
If you plan to eat the dried fruit soon after drying, there isn’t much you need to do for preparing it. Just clean the fruit, remove any large seeds, cut into slices no more than ¼ inch thick, and put the slices into your dehydrator.
You can even dehydrate some fruits whole, such as strawberries, blueberries, and cherry tomatoes (yes, tomatoes are a fruit!). I still prefer to slice up most fruits as it speeds up drying and gives more uniform results.
Killing Eggs and Larvae
I used to have a plum tree in my yard. Since we didn’t spray it with pesticides, there were always some insect larvae inside the plums.
As a general rule, you shouldn’t dehydrate any fruits which have larvae, eggs, or broken skins (broken skin means they could have insects inside). I didn’t want to let all those plums go to waste though.
If you can get over the yuck factor, there’s nothing wrong with eating some larvae – it’s just extra protein. The issue is that dehydrating won’t kill eggs.
They will hatch and take over your pantry (I’m speaking from experience!). Treating the fruit with one of the methods below will prevent an annoying infestation.
You’ve got three options if you want to dry fruit which may be infested:
- Blanch fruit before dehydrating: This will change the texture and taste of the fruit though, and also cause some nutrients to be leached into the water.
- Pasteurize after dehydrating: When you are done drying the questionable fruit, you can pasteurize it by putting it in the oven at 175F for 15 minutes or 160F for 30 minutes.
- Freeze after dehydrating: Alternatively, you can put the dried fruit in the freeze for at least 48 hours.
Pretreating Fruit for Long-Term Storage
If you plan on storing your dried fruit for a long time, then it is best to pretreat it. The pretreatment will stop enzyme reactions which cause the food to spoil and nutrients to breakdown.
Commercially-dried fruits use sulfur treatments. Since most of us don’t have access to sulfur (and it is unhealthy anyways), use one of these natural pretreatment methods instead.
- Ascorbic Acid: Also known as vitamin C, you can buy packages of ascorbic acid powder from Amazon. You’ll want to mix 1tsp of ascorbic acid (3000mg) into 1 cup of water. Cut the fruits into slices for dehydrating then put them in the ascorbic acid mixture for 5 minutes. Drain and then dehydrate.
- Fruit Juice: Some fruit juices – such as lemon, orange, and cranberry – contain a lot of vitamin C. So, you can use them just like you would an ascorbic acid treatment. The nice thing is that the juice treatment can add a nice flavor to the dried fruits, and you can drink the juice afterwards.
- Honey: If you use this treatment method, your dried fruits will end up super-sweet and a bit sticky. Simply mix ½ cup of honey with 1 ½ cups of warm water. Make sure the honey is dissolved in the water before soaking the fruit in it for 5 minutes.
- Blanching: This will change the texture and flavor of the fruit, but is great for helping the fruit last longer. It varies by fruit, but you’ll generally need to blanch for 3-5 minutes.
Want to make fruit leather? It is easy. Just blend up the fruits in a high-speed blender. You might need to add some water or juice to get a good puree.
With thicker fruits, like bananas or apples, the puree can go straight on your dehydrator’s fruit leather sheet.
If you have really juicy fruits, such as blueberries, you’ll need to strain the puree through a cheesecloth (a clean kitchen cloth also works).
Save the strained juice to drink! It is healthy and delicious.
2. Temperature for Drying Fruits
As a general rule, you’ll want to dry fruits at temperatures of 130-140F. Many nutrients in fruits are very sensitive to heat. This temperature range will keep most of them intact.
However, note that most fruits will sweat a lot when they start to dehydrate.
The sweating causes the temperature inside the dehydrator to increase. So, even if your dehydrator is set to 140F, the actual temperature inside might be around 120F.
To counteract the sweating, you can set the temperature higher than 140F for the first two hours of drying. This will speed up the drying time drastically too.
3. How Long to Dehydrate Fruits
You can find charts telling you exactly how long to dehydrate fruits. These are great guidelines, but don’t take them at face value. You should always manually check to see if the fruit is dry enough!
To check if a fruit is adequately dry:
- Cut it in half. No moisture should be released when you squeeze it.
- Fold the fruit in half. It should be bendable and not brittle.
- Stickiness – the fruit should not stick to itself when bent in half.
4. Conditioning Fruits after Dehydrating
Never package dried fruits immediately after dehydrating. They will release some moisture and this moisture will get into the packaging. As a general rule, wait 60 minutes. The fruit should also be cool when you package it.
You don’t want to wait too long before packaging though, because insects can start laying eggs on the dried fruit.
You also need to condition fruit before packaging it (especially for long-term storage). Fruits never dry equally, so some will have more moisture in them than others.
To condition the fruit, simply seal the fruit in a large Tupperware container or plastic bag. The drier pieces of fruit will absorb moisture from the wetter pieces.
It takes about 10 days to fully condition fruit. It’s a pain, but don’t skip this step if you plan on storing the fruit for a long time.
The sugar and acids in fruits actually inhibit the enzymes which cause them to break down. That’s why fruits are so easy to dehydrate.
By contrast, vegetables have a lot less sugar and acids. They will start to go bad and lose their flavor much faster.
Some veggies are also very high in fiber. This can make them incredibly tough after dehydrating – it will be like eating tree bark. You’ll need to rehydrate them, which can take hours if you don’t prep them properly.
*Note: Anything which has a seed is technically a fruit. So that means cucumbers, zucchini, bell peppers, and lots of other produce are actually fruits. This is a big pet peeve of mine. However, I’m still going to put those items in the veggie section because they have low sugar contents and get dehydrated like veggies.
1. Preparing Vegetables for Dehydrating
One of my first experiments with dehydrating veggies was for a trail soup. I dried slices of raw veggies and mixed them with seasonings. Then I boiled it all to rehydrate into soup.
I boiled the dried veggies for 30+ minutes. Some of the veggies got soft. But the carrots and mushrooms were still rock hard.
What was my mistake? I didn’t blanch the veggies before dehydrating them.
Blanching or No Blanching?
There is a lot of debate as to whether you have to blanch (or steam, boil, cook) veggies before dehydrating.
On the plus side, blanching:
- Helps the veggies last longer because it destroys enzymes which cause the veggies to spoil and lose flavor.
- Decreases rehydration time because they are already precooked. This is crucial with veggies that already take a long time to cook, such as carrots and onions.
- Shortens dehydration time because the tissues are softer and moisture escapes more easily.
On the down side, blanching:
- Removes nutrients, especially heat-sensitive and water-soluble vitamins.
- Could cause veggies to get mushy, especially in dishes like casseroles which get cooked for a long time.
Ever since my soup fiasco, I always blanch some veggies before dehydrating. This includes anything which is tough or takes a long time to cook (carrots, mushrooms, beets, corn, peas…).
I don’t blanch veggies which cook very quickly (such as leafy greens like kale or spinach).
Bear in mind that I am using my dehydrated veggies for backpacking meals. I need them to rehydrate quickly. If you are using them at home in dishes that get cooked for hours (such as crock pot meals), then the rehydration time doesn’t matter as much.
Blanch before Dehydrating
- If you need the veggies to rehydrate quickly, such as for backpacking meals
- If the veggie is very tough or fibrous
- If you will be storing the dried veggies for the long-term
- If the veggie normally takes a long time to cook, such as carrots or onions
- Corn, peas, and beans should always be blanched before dehydrating
- If you would eat the veggie raw, such as sundried tomatoes on a salad
- If you are concerned about losing nutrients during the blanching process
- If you will grind the dried veggies into a powder
- If the veggie cooks very quickly, such as kale or spinach
How to Blanch Veggies
I prefer the steam-blanching method because it keeps the most nutrients. Cut up the veggies as you would for dehydrating. Then layer them in the steamer basket no more than 2 inches deep.
The blanching time varies depending on the vegetable. As a general rule, the blanching is done when the veggie has turned a brighter color.
It should be softer but still have a bit of crispiness to it. You don’t want soggy veggies!
Dehydrating Canned and Frozen Vegetables
It is always best to dehydrate fresh veggies. The texture and taste will be a lot better. However, you can dehydrate canned and frozen veggies too.
Canned veggies usually turn out disgusting when dehydrated and rehydrated. They are already soggy from soaking in the can. The dehydrating-rehydrating process causes their cell walls to further break down, making them even soggier.
Frozen vegetables get better results. They will still be a bit soggy after rehydrating, but retain much more of their texture and flavor.
2. Temperature and Drying Time for Vegetables
Like fruits, veggies should be dried at temperatures of 130-140F to retain their nutrients.
Veggies don’t sweat as much as fruits though, so you don’t have to put the temperature up higher for the first few hours of dehydrating.
Veggies need to be much drier than fruits (since they don’t have the sugars or acids to act as natural preservatives). You only want about 5-10% moisture to remain.
This means the veggie should be brittle. When you bend the veggie, it should break.
3. Using Dried Vegetables
Most vegetables don’t last very long when stored. They should really be consumed within 6 months of drying.
If you blanch the veggies and use an expert-level storage method (more on this later), then you can get them to last for years.
The dried veggies can be used in soups, stews, or casseroles. In theory, you can rehydrate the veggies and snack on them. However, the texture is usually disgusting.
You can also make yummy veggie chips out of dried vegetables like kale and beets.
Using Different Dried Veggies in a Meal:
Note that vegetables rehydrate at vastly different rates.
If you want to make a soup, for example, you can’t just throw all the dried veggies into the pot at the same time. Some veggies will end up tough and others soggy.
It is better to keep your veggies stored separately and add them to the dish one by one.
For example, when making a dried veggie soup, I would first add the dried mushrooms and carrots (which take longest to rehydrate) and then add dried veggies like tomatoes and peppers.
With casseroles and creamed dishes, texture doesn’t matter as much so you can get away with putting all the dried veggies into the dish together.
However, really think about how you want to use the dried veggies before mixing them.
More on this in the section about making dehydrated meals.
Starches last a long time on their own, so most people don’t bother with dehydrating them. But you can actually do some cool things by dehydrating starches – especially if you want to make backpacking meals.
Here are some ideas.
Potatoes and Other Root Veggies
I personally never make dried potatoes because you can buy instant mashed potatoes in the supermarket (which is just dried potatoes which have been ground up into flakes).
However, you could easily make your own instant dried potatoes in your dehydrator. Other root veggies work great too, such as sweet potatoes, carrots, celery root, and turnips.
To make dried root veggies:
- Boil the veggie.
- Blend into a mash.
- Spread the mash onto a fruit leather tray.
- As it dehydrates, it will start to crack apart.
- The veggie is done when it resembles cardboard and easily flakes apart.
Backpacking Chef, who is one of my favorite experts on dehydrating, calls these bark. You can use the bark to thicken soups or reconstitute into a mash.
Pastas and Rice
Pasta is already dry. So why the heck would you boil pasta and then rehydrate it? It turns out that cooked-then-dehydrated pasta cooks a lot faster.
This matters if you are making survival meals where you don’t want to waste a bunch of fuel by boiling pasta for 20 minutes.
The same goes with rice. Where brown rice might take 40+ minutes to cook, dehydrated rice takes only about 5 minutes of cooking to rehydrate.
In some cases, you don’t even need to boil the pasta to rehydrate. Spaghetti and angel hair pastas, for example, will rehydrate almost instantly in boiling water.
You can even rehydrate them without boiling if you let them soak long enough – which is great for situations when you can’t boil water.
- Cook pasta in salted water.
- When done, submerge in cold water to stop the cooking process.
- Drain excess water.
- Dehydrate at 135F for 2-4 hours, or until hard.
Bread and Crackers
Make your own croutons by dehydrating bread. This is really simple so I won’t delve into it too much.
If you want to take things to the next level, you can also make your own raw dehydrator breads using sprouted seeds. There are also lots of great recipes for crackers you can make in the dehydrator.
Here are some ideas to get you started:
- Zucchini dehydrator bread
- Dehydrator bread from almonds and sun-dried tomatoes
- Raw bread from cauliflower and zucchini
- Crispy Mexican crackers
Dehydrating meat takes a lot more care than with fruits and veggies because you’ve got to worry about pathogenic bacteria and parasites.
However, this doesn’t mean you should be put off the idea of making your own jerkies.
1. Safety Precautions for Making Jerky
It is really important that you clean and sterilize everything before making jerky. You’ve also got to be careful that the meat doesn’t have a chance to start growing bacteria.
You’ll need to:
- Sanitize all equipment such as cutting boards, knives, drying racks, and tongs. Use a solution of 2 Tbsp. bleach to one gallon of water.
- Thoroughly wash your hands before handling the meat.
- Keep meat refrigerated at 40F or below before using.
- Do not thaw frozen meat on the counter. Always thaw it in the fridge.
- Marinate meat in the fridge.
- Use meat from a safe source. If using hunted game, make sure that the game has been dressed properly. If the animal was wounded in the gut, the gut contents may come in contact with the meat and contaminate it. If there is any doubt, don’t make jerky from the game – use it in a way where it gets completely cooked at high temperatures.
Temperature for Dehydrating Meat
To kill bacteria, a temperature of at least 160F is usually recommended. However, most dehydrators do not reach this temperature. If you know you want to make jerky, it is worth it to buy a dehydrator which can get to higher temperatures.
If your dehydrator doesn’t reach this temperature, you should treat the meat.
There are two ways of doing this:
- Boil in the marinade: Soak the meat in the marinade. At the end of the marinating time, boil the meat + marinade for 5 minutes. Use a thermometer to make sure the meat reaches 160F. Drain and dry before dehydrating. Unfortunately, this does make the resulting jerky a bit crumbly.
- Bake after dehydrating: If you didn’t boil the meat in the marinade, then you should bake the jerky in the oven at 275F. Use a thermometer to ensure the meat reaches 160F.
*To make sure that the meat or jerky is reaching 160F, place a meat thermometer between two pieces. This ensures that the meat is actually getting to temperature, not just the air around it.
Jerky recipes will always call for some sort of acidic ingredient, such as vinegar or vitamin C. If the recipe doesn’t have an acid, don’t use it! The acid is important for kill bacteria and maintain freshness.
Trichinella is a parasitic worm which is mostly found in pigs, wild boars, and carnivores. The parasite’s larvae live in the muscle tissue of the animals.
When you eat undercooked meat containing trichinosis, the larvae get into your intestines. There the larvae mature into adults and begin producing more larvae. Those larvae then travel into your muscles.
Medicines can kill the parasites in the stomach. However, medicines cannot kill larvae in your muscles! The larvae can live for years in your muscles. When they die, they calcify and cause pain.
My mother-in-law got trichinosis from eating undercooked pork. She had to take medicines every day for the rest of her life. It is no joke!
Dehydrating does NOT kill trichinella. Nor does salting, microwaving, or smoking.
Freezing CAN kill trichinella in pork. However, freezing does not kill trichinella in wild game.
2. Preparing Meat for Dehydrating
Always remove all fat from meat before dehydrating. Fats don’t dehydrate and will cause the jerky to go rancid quickly.
Meat should always be cut into slices a maximum of 1/4 inch thick. It is really hard to cut thawed meat this thin. A good trick is to freeze the meat slightly before cutting.
Cut the meat with the grain for the best texture.
Once you have cut the meat it is time to marinade it. If you are going to preheat the meat (as opposed to treating it in the oven after drying), then do this at the end of the marinating process.
3. Temperature for Dehydrating Meat
You should always use the highest heat setting on your dehydrator for making jerky. Ideally, it should be at least 160F for safety reasons. However, most dehydrators won’t reach this temperature.
At the very least, your dehydrator must maintain a temperature of 145F to dry meat safely.
Even if your dehydrator claims to get to 160 degrees, this might not be the case. With vertical-flow dehydrators, the upper trays can be a lot cooler than the bottom ones. Horizontal-flow dehydrators are more consistent, but the area near the door might be a lower temperature.
Since temperature dials are unreliable (even on the best dehydrators), it is good practice to determine the true temperature of your dehydrator:
- Test temperature while the dehydrator is empty. Do not check temperature when there is food in the dehydrator since sweating/condensation can lower temperatures.
- Put a thermometer inside the dehydrator. For vertical-air flow dehydrators, put the thermometer on the second or third tray from the bottom. For horizontal-air flow dehydrators, put the thermometer near the door.
- Set the dehydrator to the highest setting.
- Check the thermometer after about 20 minutes.
If the temperature doesn’t read at least 145F, then your dehydrator shouldn’t be used to dry meat. The warm air will just cause bacteria to multiply, making it unsafe to eat – even if it looks dry and done.
*Two dehydrators which can actually get to 160F are the Gardenmaster, the Excalibur. They are a bit pricier models, but worth it if you want to make jerky.
4. How Long to Dehydrate Jerky
Meat should be dehydrated for at least 4 hours. Some types of meat may need to be dried for 12+ hours. Never go by recommended drying times alone. You need to check to make sure the jerky is thoroughly dry before removing it from the dehydrator.
Jerky should be leathery, but not so dry that it is brittle. To check doneness, bend a piece of cooled jerky. It should crack apart but not break when bent.
Again, it is important that the temperature is reaching at least 145F during this time. Otherwise the jerky will seem dry and done, but bacteria will still be present.
Removing Oil during Drying
As you dry the jerky, you’ll notice that some oil accumulates on the top. It is very important that you remove oil from the jerky while it is drying. To do this, pat it with clean paper towels. If you don’t remove the oil, the jerky will go rancid much faster.
Unfortunately, since you have to remove oil during drying, you can’t just “set it and forget it.” You’ll need to check at least twice during the drying process and remove any accumulated oil.
Basic Jerky Recipe
- Slice 4lbs of meat of your choice into ¼ inch strips. Make sure you are cutting with the grain. It is easier to cut if the meat is partially frozen.
- Mix brine together in a large pot: ½ cup soy sauce, 2 Tbsp Worcestershire sauce, and 1/2 tsp black pepper. You can add other seasonings like dried garlic, dried onion, parsley, smoked paprika and liquid smoke.
- Bring the marinade to a full boil.
- Add a few of the sliced meat strips to the brine.
- Let the brine come to a boil again. Make sure the meat strips are covered by the marinade.
- Remove the meat strips from the brine. Use sterile tongs and place them on a sterile surface.
- Repeat until all meat strips have been boiled in the brine.
- Put strips on your dehydrator trays. Make sure there is space between the strips for adequate air flow.
- Dehydrate at the maximum temperature setting for 3-4 hours. Then lower the temperature to 145F. It will probably take another 4 hours until they are completely dry.
- Use clean paper towels to remove any oil that accumulates during the drying process.
Because fish contains so much oil, it is harder to dehydrate into jerky. If you are just getting started with jerky, use leaner fish with less oil. You can dehydrate oily fish, but it will need more salt and won’t last as long outside of the fridge.
Before dehydrating fish, you’ll need to add at least 1 ½ tsp of salt per pound of fresh fish. Rub the salt into the fresh fish and let it marinate (in the fridge) for at 4-8 hours before you start dehydrating.
You can also add other seasonings with the salt.
Because fish is so oily, the final product might seem moist. It will be very tough when it is done.
If you aren’t sure whether the fish jerky is completely done, keep it in the freezer until you are ready to eat it.
Nuts and Seeds
Nuts and seeds already last a long time on their own, so most people don’t bother drying them. I personally use a lot of nuts in my backpacking dehydrator meals.
For example, I make a tasty sauce out of soaked cashews, lemon juice, tomato sauce, and salt. It gets blended together and then dehydrated. Just add water and put on top of pasta.
Nuts and seeds are high in oil though. The oils can make them go bad faster. You’ll notice an off taste when they start to go bad.
You can buy dehydrated eggs from companies like Valley Food Storage Company (see our review of the Top 5 Emergency Food Brands).
Dried eggs tend to be very expensive though, which is why a lot of people – especially those with backyard chickens – want to dehydrate eggs.
The bad news is that it is very hard to dehydrate eggs. You’ve got two options, drying raw eggs or drying cooked eggs. Neither will produce good results for scrambled eggs. However, dried raw eggs do work well in baking.
If you want to dehydrate eggs, here is what you need to know:
Safety Issues with Dehydrating Eggs
The dry eggs you buy from food companies are made with a process called “spray drying.” The eggs are liquefied, pasteurized, and then shot through a spray nozzle. The spray is shot into a heated tank which removes moisture from the liquid. By the time the eggs land, they are already in powder form.
Those commercially-dried eggs also have their sugars removed from them. This helps them last longer and prevents bacterial growth.
Since we can’t do this at home, there’s a very-real risk of salmonella poisoning from dried eggs. The USDA recommends heating eggs to a temperature of at least 160F before eating. As talked about in the meat dehydrating section, most dehydrators don’t get to this temperature.
If your dehydrator doesn’t get to 160F, then you should cook them before dehydrating… but cooked eggs don’t rehydrate well.
Dehydrating Cooked Eggs
To dehydrate cooked eggs, you first need to make scrambled eggs. Then you dehydrate the scrambled eggs on fruit-leather trays.
Because of the high fat content, it will take a LONG TIME for them to dry. I’m talking 10+ hours. If the eggs are still gummy, they aren’t dry enough. They need to be rock hard clumps.
Here’s problem #2: You need to grind up those rock-hard egg clumps into a powder. Even a high-powered blender can have problems doing this. Do NOT use a coffee grinder. It will destroy it!
Now, how do you use these dehydrated scrambled eggs? The texture is disgusting if you try to rehydrate them back into scrambled eggs.
My suggestion would be to add them to casseroles, rice, or pasta sauce. They will add protein to the dish and you won’t notice the weird texture so much.
Dehydrating Raw Eggs
Some websites suggest dehydrating raw eggs at 140F for 10 hours. This is not hot enough to kill salmonella. Don’t risk it! If your dehydrator can’t reach 160F, then use a different method of storing your eggs (pickling, for example).
To dehydrate raw eggs, you’ll need to blend them. Then spread the egg mixture onto a fruit leather sheet.
Set the dehydrator to at least 160F, let it preheat, and then dry the eggs for 10-12 hours. The eggs are done when they are very brittle. Use a high-power blend to grind into a powder.
How do you use dehydrated raw eggs? You could try to make scrambled eggs – but I don’t recommend it. The texture is disgusting.
However, powdered dry raw eggs do work pretty well in baking.
- 1 Tbsp dried egg powder + 2 Tbsp water = 1 egg.
Milk, Yogurt, and Dairy
I never bother with dehydrating milk because you can buy milk powder for very cheap. Plus, food dehydrators aren’t really make to remove liquid. Rather, they are meant to remove humidity from foods.
However, I do find it worthwhile to dehydrate yogurt and other dairy products (such as ricotta cheese and other soft cheeses). Hard cheeses like cheddar don’t dehydrate well since they have such a high fat content. They will go bad!
It will take a LONG TIME to dehydrate milk (around 10 hours). The issue is that mold or bacteria could start growing on the milk during the dehydrating time.
Most websites recommend using a temperature of 135F to dehydrate milk. To speed up the process and avoid the risk of bacteria growing, I’d set the temperature higher for the first hour. The same goes for yogurt.
You’ll know the milk or yogurt is done when it crumbles easily into a powder. It shouldn’t be cardboard-like.
Ricotta will get some rock-hard clumps in it when dehydrated. Don’t grind it into a powder though – you want those clumps so it rehydrates into its normal clumpy consistency.
*Milk, yogurt, and ricotta turn a yellowish color when dehydrated. This is completely normal!
Beans are already dry. So, why the heck would you dehydrate them?
Just like with pasta, dehydrating cooked beans drastically reduces dehydrating time.
I personally do this a lot when making backpacking meals. I simply don’t have 2 hours to presoak and cook beans when on the trail.
For all of you preppers who want to make emergency meals, the same applies – do you really want to spend over an hour cooking a meal during an emergency? Imagine how much fuel you’d waste!
Here’s how it works.
- I cook a huge batch of beans (you can skip this step and just use canned beans).
- Then I dehydrate the beans until they are dry again.
- To rehydrate, I just boil them for a couple minutes.
Making Dehydrated Meals
Here is where we really get into expert-level dehydrating. You can save yourself a lot of money by making your own just-add-water meals.
Not only are DIY dehydrator meals cheaper, but they are a lot healthier. A package of Mountain House beef stew, for example, has 870mg of sodium. That’s more than half of the RDA!
There are three ways that you can make dehydrated meals.
Method 1. Dehydrate the entire meal
This works really well with meals that are saucy, such as:
- Cream soups
- Pasta sauces (dehydrate pasta separately)
- Dips and spreads (hummus is a personal favorite)
This method does NOT work well with meals with chunks of ingredients that have different rehydrating times. For example, you wouldn’t want to rehydrate minestrone soup. Some of the ingredients would get mushy when rehydrated and others would be still hard.
- Cook the meal. For soups, stews, and sauces, use about half as much liquid as you’d normally use.
- Spread it on fruit leather sheets on your dehydrator.
- Dehydrate at 135F for around 8 hours, or until dry throughout.
- To rehydrate, cook a few minutes in boiling water.
- Meat should be dehydrated separately!
- Don’t add too much water when rehydrating sauces or it will end up too thin.
Method 2. Dehydrate and assemble
With this method, you dehydrate all of the ingredients separately. Then you assemble the individual ingredients into one meal.
You’ll want to use this method when the ingredients have different rehydrating times. For example, if you try to dehydrate chicken noodle soup, you’ll end up with soggy noodles, chewy chicken, and some veggies too soft and others too hard.
Basically, you are using this method for any meal where the ingredients could easily be picked apart from each other, such as:
- Non-creamed soups
- Chunky stews
- Pasta, rice, and grains with topping
- You need to store each of the ingredients separately (or at least the ones that have very different rehydrating times). Otherwise some ingredients will get soggy by the time the others rehydrate.
- You must cook the veggies before dehydrating them or it will take hours for them to rehydrate. Seriously, I’ve tried making soups from dehydrated raw veggies. The raw tomatoes rehydrated okay, but there were hard little chunks of dried carrots and onions in the soup even after 40 minutes of boiling!
Here’s an example of how I’d make minestrone soup on the trail:
- Boil water. Add seasonings to water (salt, pepper, parsley, etc.)
- Add dehydrated blanched onions, garlic, and carrots. Let cook about 5 minutes.
- Add dehydrated blanched tomatoes and scallions. Let cook a few minutes.
- Check that the onions, garlic, and carrots are soft. If not, cook for a few more minutes.
- Add dehydrated cooked lentils and dehydrated cooked pasta. Let cook a few minutes.
- Remove from heat and let sit a couple minutes before eating.
This method takes more active prep time than with creamed soups. However, it is still only about 15 minutes on the trail (or in an emergency) to get a healthy, hot meal. I’d say it’s worth it!
Method 3. Supermarket foods + dehydrated add-ins
There is no reason that you have to dehydrate the entire meal. I like to find quick-cook foods at the supermarket and then spruce them up to make them more nutritious and filling.
- Couscous + dehydrated veggies and chickpeas
- Beans and rice in a box + dehydrated veggies
- Instant mashed potatoes + dehydrated gravy
Bear in mind that things have different cooking/rehydrating times.
For example: It takes only about 2 minutes to cook couscous (which is why I love it for backpacking). But it takes around 5 minutes to rehydrate most veggies and proteins. So, I would need to first rehydrate the veggies and then add the couscous to the pot. If I threw everything in together, I’d end up with hard veggie chunks in the couscous.
It will take some experimenting, but it is really worth it. You can make some amazing meals with dehydrator foods. Once you’ve got a few good recipes under your belt, you can dehydrate large batches of them to have for backpacking, emergencies, or days when you simply don’t feel like cooking.
Expert Tip: You can speed up the rehydration process by grinding the dehydrated food into a powder. For example, I make mushroom powder to add to mashed potatoes. The mushroom powder goes into the water first to boil a few minutes. Then I add instant mashed potatoes. Voila! A tasty dish.
Storing Dehydrated Foods
If you plan on using your dehydrated foods soon, then you can keep them in mason jars or plastic bags. However, for anything which will be stored for more than a couple of weeks, I’d strongly suggest using vacuum-sealed Mylar bags with oxygen absorbers.
You’d be amazed at how quickly insects can lay eggs on dried food. If you didn’t freeze/cook the foods beforehand, then the food might have already had eggs on it before drying. Those eggs quickly turn into larvae and adults (you can also freeze foods for 48 hours after dehydrating to kill eggs).
Speaking from experience, it is really hard to get rid of a moth infestation once you’ve got them. Better to store your dehydrated foods properly than risk infestation!!!
Seriously, YOU WILL GET MOTHS if you don’t store the dried foods properly! I’m repeating myself because this is so important.
Here are some additional notes about storing dehydrated foods:
- Wait until the food has completely cooled down before storing. Otherwise the heat will get into the storage container.
- But put foods for storage quickly. You’d be surprised how fast insects can lay eggs on dried foods.
- If not using vacuum-sealed Mylar bags, you should at least use glass jars with rubber gaskets. Insects can get into normal jars!
- Plastic zip-lock bags are not suitable for storing dried foods. They don’t keep moisture or air out and foods will spoil eventually. Plus, insects can penetrate these bags (again, I’m speaking from experience!).
- Tupperware containers also aren’t suitable for long-term storage of dehydrated foods. They don’t keep out air, moisture, or insects.
- Don’t store fruits and veggies in the same container. The flavors will combine and cause a really weird taste.
Common Dehydrating Mistakes
1. Buying the wrong dehydrator:
If you know that you want to make jerky or dehydrate things like dairy or eggs, then you really need a dehydrator which can get to 160F. You can still dehydrate these things at a lower temperature, but the risk of bacteria growing is high. Better to play it safe than sorry!
2. Relying on drying guidelines to determine when a food is “done”:
You’ll notice that I didn’t include a chart of foods with their drying time/temperatures. That is because these charts are highly unreliable.
For example, it’s taken me 4 hours to dehydrate apples. It’s also taken me 7 hours to dry apples in the same dehydrator and at the same temperature setting. Why the big difference? It has to do with the moisture content of the apples.
Those charts are good for general guidelines, but don’t follow them precisely. You should always check the food yourself to make sure it is dry enough.
Read the sections about “Drying Time and Temperature” to learn how to tell a food is dry enough.
3. Dehydrating different foods at the same time:
When you dehydrate different foods at the same time, they will pick up each other’s tastes and smells. This is okay if all the final ingredients are going into the same dish (such as if you are dehydrating a bunch of veggies for a casserole). However, some foods will taste nasty if dehydrated together.
Bananas and onions, for example. Or peaches and fish.
Gross! Keep these foods separate.
4. Stopping dehydrating in the middle:
Never start dehydrating foods if you won’t be able to finish the batch in one go. You cannot stop the dehydration process in the middle and pick it up later. The food will start to spoil and you’ll get bad results that may even be unsafe to eat.
5. Not testing dehydrated meals before packaging:
I learned this the hard way. I was backpacking and tried to rehydrate a soup I’d made on the dehydrator. The chunks of carrots stayed hard even after a long boil (it was because I hadn’t pre-cooked the carrots).
If you are going to make emergency meals on your dehydrator, make sure you test them first. You don’t want to end up in a situation where you discover your dehydrated meals didn’t succeed but you’ve got nothing else to eat.
To test a meal, just remove a small portion. Then add water or boil it (depending on how you plan on rehydrating it later). Eat the results and see how they turned out.
6. Not allowing enough time for rehydrating:
This is why you need to test dehydrated meals before using them in the field. Rehydrating can take a lot longer than anticipated.
Even with individually-dried ingredients, rehydration time is important to remember. You don’t want to add dried onions to a casserole only to end up with bits of chewy onion in every bite!
7. Drying oily or fatty foods:
Oil doesn’t dehydrate. When you dehydrate oily foods, it will start to go rancid. This is why it is so important to remove fat from meat before making jerky.
This is also important for when making dehydrated meals. I generally will make the meal without oil, dehydrate it, and then add a squirt of oil to it after rehydrating.
8. Not killing pests before dehydrating:
This is something that I mentioned numerous times throughout the guide because it is so important. Even if you can’t see them, fruits and (to a lesser extent) veggies will have some insect eggs on them.
Dehydrating does NOT kill insect eggs. Those eggs will eventually hatch on your dried foods and multiply into an infestation. Always kill pests by cooking the food before dehydrating or freezing the dried foods afterwards.
9. Improper storage:
Dehydrated foods can usually last around 1-6 months in jars or Tupperware. However, you still risk getting insect infestations when you store them this way. I’m speaking from experience! Moths somehow can get inside closed jars and plastic containers!
Jars and Tupperware also won’t keep out moisture or light. Your dehydrated foods will go bad much faster.
If you want your dehydrated foods to last a long time, then you should keep them in the freezer or invest in mylar bags + a vacuum sealer.
Remember, the secret to storing dehydrated foods are Dry, Dark, and Cool.