Our new experiment started today. I finely sliced and diced a Mars (right) and a Red Candy Apple (left), laid the pieces on parchment on a sheetpan, and slid it into our dehydrator (the enclosed space on top of our frig and freezer.
Should this prove to be a success, we will be able to make our own onion powder and have our own dried onion flakes. It has worked for garlic, sweet corn and herbs.
Update August 10, 2010: The onions seemed to have successfully dried, although they still feel slightly sticky. Is this because they are sweet onions? They certainly taste good in casseroles. I put the remaining couple of tablespoons in a jar. Will see how they keep.