Wash oranges thoroughly and slice into 1/8-inch thick rounds. Remove any seeds.

Bring 4 cups of water to a boil. Add orange slices and blanch for 3 minutes to reduce bitterness. Remove and set aside.

In the same saucepan, combine sugar, corn syrup, and 1 cup water. Stir over medium heat until sugar dissolves. Bring to a boil, stirring occasionally.

Add blanched orange slices to the boiling syrup. Reduce heat and simmer for 20-25 minutes, or until translucent and tender, turning occasionally.

Remove slices and place on a wire rack to cool and drain completely (a few hours).

Melt chocolate in a double boiler or microwave. Dip each dry orange slice in melted chocolate, ensuring full coverage.

Place chocolate-covered slices back on the wire rack to set. Once set, store in an airtight container in a cool, dry place.