Prepare the peel – Wash oranges thoroughly. Cut off the ends and score the peel into quarters. Remove the peel and cut into thin strips.
Boil to remove bitterness – Place strips in a saucepan, cover with cold water, and bring to a boil. Drain. Repeat this step 2 more times.
Make sugar syrup – In the same saucepan, combine 2 cups sugar and 1 cup water. Bring to a simmer, stirring until sugar dissolves.
Cook the peel – Add orange strips and simmer over low heat for 45–60 minutes until the peels are translucent and syrupy.
Dry – Remove peels with a slotted spoon and place on a wire rack set over parchment. Let dry 6–12 hours.
Coat in sugar – Toss dried peels in granulated sugar until fully coated. Store in an airtight container.