Wash the oranges thoroughly under cool water and slice them into ¼-inch rounds.

In a large skillet, combine the granulated sugar and water, stirring until the sugar dissolves completely; bring to a rolling boil.

Reduce heat and add the orange slices to the syrup in a single layer, letting them simmer for 45 to 60 minutes.

Once translucent, remove the slices from the syrup and lay them on a wire rack to dry.

Store the dried orange slices in an airtight container at room temperature for up to one month.