Dehydrating…
- is easy
- preserves nutrients
- saves energy
- is space efficient
As a food preservation technique dehydration is only eclipsed by root cellaring for preserving valuable nutrients. Dried foods have a 3-5% nutrient loss; compare this to freezing’s 30-40% or canning’s 60-80% nutrient loss.
You can dehydrate fruits, vegetable and meat using a variety of methods. There are convection ovens designed with dehydration settings (check your users’ manual), electric dehydrators (sold in most department stores) and solar dehydrators (which you can build yourself). More creative methods are out there too, like dehydrating in the back window of your sun-drenched car or using the low heat from the pilot light on your gas stove.
However you dehydrate your food, the trick is in keeping a steady low temperature and low humidity. Dehydration temperatures need to be high enough to prevent mold from setting in,
but low enough not to cook the food as the moisture is being extracted. The optimal range is between 120-140°. Here’s a great how-to site from the National Center for Home Food Preservation on the topic.
Bea Reddy’s dehydrated tomatoes that you see featured here will be dropped into winter soups or reconstituted with oil olive for stir fries.