01 -
Scrub the oranges well and pat dry. Trim off the ends, then slice into even 1/4-inch rounds. Remove any seeds.
02 -
Combine the sugar and water in a wide saucepan. Bring to a boil over medium heat, stirring until the sugar dissolves and the syrup turns clear.
03 -
Add the orange slices and cinnamon stick if using. Reduce to a gentle simmer and cook for 45-60 minutes, turning occasionally, until the peel is tender and the centers look translucent.
04 -
Use tongs or a slotted spoon to transfer the slices to a wire rack set over parchment. Let the excess syrup drip off.
05 -
Let the slices dry at room temperature for 8-24 hours. For a quicker finish, dry in a 200°F oven for 45-60 minutes, then cool completely.
06 -
Sprinkle or roll the slices in sugar if desired. Dip in melted chocolate once fully dry if using. Store between parchment sheets in an airtight container.