Onions
Firm, pungent storage onions will keep for months in a cool, dry basement, and even longer in a root cellar. But Vidalias and other sweet, mild onions don’t store well. To preserve their goodness, just chop them up and freeze them in plastic containers.
You can also dry 1⁄2-inch-thick onion slices in a dehydrator, then grind the dried slices into flakes or powder to use as a seasoning.