Step 1

Preheat the oven to 175° F.

Step 2

Wash and dry the oranges, then slice crosswise ⅛-inch thick.

Step 3

Set slices in a single layer on baking sheets topped with wire racks.

Step 4

Cook for 4-6 hours, until dry to the touch, rotating every few hours for even cooking.

Step 5

Cool completely before storing or using. Store in an airtight container at room temperature for up to one month.