8 apples, peeled, and thinly sliced. If using organic apples you can leave the peel, but I find that the rings get softer without it. I have tried different apples, but Gala and Granny Smith are my favorites. I prefer the apple rings plain, but sometimes I sprinkle them with a little cinnamon before putting them in the dehydrator. Spread the apple rings out on the trays, and let them dehydrate for 8-10 hours.