How to Dry Fresh Red Onions. Red onions have purple-toned skin and white flesh with a slightly sweet flavor in comparison to other onions. You can consume red onions raw, cooked or dehydrated, though they often lose their distinctive color when cooked. Drying fresh red onions will preserve them for use in soups, stir-fries and other meals for up to two years. To dry fresh red onions, ensure your oven is free for the next 24 hours before you begin.

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