- Cut thin slivers of peel from 1 orange. Don't cut into white membrane.
- Cover peel with boiling water; let stand 5 minutes. Drain.
- Heat orange peel, water and sugar to boiling; simmer uncovered until slightly thickened, 10 to 15 minutes. Cool.
- Cut oranges into slices.
- Pour syrup over slices; cover and refrigerate.
- Garnish with sprig of mint if desired.