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Dehydrating Onions

One of our customers gave me a box of Vidalia Onions. Since there are only three adults in the household and one is allergic to onions, I need to preserve them somehow. I would like to dehydrate them (I already have some frozen onions). But I am confused again.

I have watched a lot of videos and read the instructions in my Excalibur guide. The Excalibur guide says no pretreatment, temp 155F, dehydrate until leathery. Some videos say blanch and some say blanching is not necessary. They all show the onions as being crisp. Some say dehydrate at 115F, some at 125F, some at 130F, and Excalibur says 155F.

I want crispy dehydrated onions. So what is the deal with the difference in temps. When is it better to use a lower temp than a higher temp. I just don't understand the theory. Some say to blanch and some say blanching is not necessary. Does blanching make them crispier or does it just speed up dehydration times.

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