How to Dry Orange (Or Grapefruit) Slices in the Oven
Oct 14, 2021 · Step 2: Preheat your oven to 80C/175F. Step 3: With a small, sharp serrated knife, slice the oranges into thin slices. The thinner the better, but I aim for 2-4mm thick (about 1/8 of an inch). The thicker the slices are, the longer they’ll take to dehydrate. You can also use a mandolin or a food processor if you prefer.