Learn to dehydrate onions in a safe way that helps you create awesome minced onions for cooking, and allows you do make your own DIY onion powder that is so much better than storebought!
So before we get started, the first question is always this:
Do Onions Smell Up the House?
Yes, yes they do. So you may want to find a way to dehydrate your onions in the garage or outside if the weather is nice. No high humidity and temps above 70°F for the best efficiency.
In our family, I'm even required to process the onions outside if I'm doing a dehydrator full. Then my machine sits on the back porch until dusk until I bring it in to finish overnight and into the next morning. The smell is less obvious by then for our family.
TIP FOR SMELL: You can blanch your onions before dehydrating them. Not only does it help cut down on the oils that smell, it helps drying time go a little faster, as well. You can cut, then blanch for 30 seconds or so, dip into an ice bath and dry, or you can caramelize onions for a richer, deeper flavor, too.
How to Dehydrate Onions
Before preparing, go ahead and preheat your dehydrator to 125°F/52°C. Don't have a dehydrator or are looking to upgrade? I have a handy resource with tips and suggestions just for you.
- Wash onions.
- Cut off the root end and peel away skins (but save them to make onion broth or vegetable broth later!)
- Cut into slices or dices of your choice. I use a Fullstar Vegetable Chopper for doing in bulk, but a knife is all you need.
- Place on dehydrator trays - separating the layers for better drying efficiency.
- Dry at 125°F / 52°C for 10-18 hrs. *
- Store in airtight containers.
* Drying times are variable. Depending on the size of the onion (more moisture and sugar), your home's humidity, the power of your machine, you could dry in as little as 10-12 hours, or from 15-18 hrs. I tend to push the longer end for drying my onions because I want them as dry as possible.
When are Dehydrated Onions Done?
Check by cooling a few samples of your onions to room temperature. They should be a little pliable, but dry.
If you blanched first, your onions should snap apart when dry.
Do I Need to Condition Dried Onions?
Yes, as with all dehydrated foods, conditioning is a vital step in the storage process. Simply put dehydrated onions into an airtight container, shake around once a day for a week or so, and check for moisture. If you see moisture forming, throw them back into your dehydrator to dry more, then recondition. If all goes well, store as normal.
DIY Onion Powder
Creating your own onion powder is as easy as 1. 2. 3.
- Put your fully dried and conditioned minced onion pieces into a grinder of your choice.
- Pulse until a powder forms.
Tips for creating your own powders:
- Powder only as much as you need for a month or two. Sometimes, especially with fruit powders and onion powder, natural sugars can make clumping an issue (and there are even more ways to help stop clumping). So only can as much as you need at for a short tie and store the rest whole.
- Dry them again - you can put them back into your dehydrator to dry again before storing if you find that maybe they are clumping more than you are happy with while grinding.
DIY Bulk French Onion Dip Powder
If you are like me, you might have people with huge texture issues with food. It's why I fell in love with dehydrating a long time ago.
I am able to supplement my food with nutritious powdered alternatives when I can't put the whole vegetable into the food. So my Vegetable Powders and mushroom powder and onion powder are invaluable to me in many ways.
It caused me to stop and think about a lot of foods we don't eat because of a texture issue - and French Onion Dip is one I missed a lot - so I created this powder to be used with a cup of sour cream instead! Same great taste, no onion bits that my crew refuses to eat!
- 1.5 TB dried onion pieces
- 1 tsp onion powder. Or try caramelized onion powder for a sweeter, deeper flavor.
- 1 tsp dried parsley
- 1/2 tsp garlic powder
- 1/4 tsp kosher or Himalayan pink salt
- 1/8 teaspoon 'paprika' aka bell pepper powder
- Mix all ingredients together.
- Grind in a coffee grinder or bullet blender
- Store in an airtight container.
- 1 Cup of Sour Cream
- 2 -3 TB of French Onion Dip Powder
- Sprinkle some caramelized onion chips on for presentation.
Shelf Stable French Onion Dip Mix
- Use all above dry ingredients
- Add 3/4 Cup of sour cream powder
Reconstitute with enough water (at least 6 TB cold water) to make you happy with the texture.
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Want more dehydrating?
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