The thick bitter rind of oranges is used in certain recipes as a food flavoring or garnish. It contains oils and has a strong flavor to that of the orange pulp. The peel is a source of vitamin C.
To make dried orange peel, wash the fruit well with running water. Dry, and peel the oranges with a sharp knife, and discard as much of the white pith from the skin as possible. Cut into thin, even pieces. Lay on a baking sheet, bake for 30-60 min at 200F. Check peels often so they don't burn (they curl when they're done). Remove from oven, let cool and store in an airtight container.