In a 12-inch skillet or large saucepan, combine equal parts white granulated sugar and water over medium-high heat. Stir until boiling and sugar is dissolved, about 5 minutes.

Reduce heat to medium and add the sliced oranges, simmering gently for 45-60 minutes until the pith turns translucent.

Using tongs, carefully remove the candied orange slices and place them on a wire rack to cool. Leave uncovered at room temperature for 24-48 hours.

Optionally, roll dried orange slices in granulated sugar for a frosted appearance before enjoying.

Store dried orange slices in an airtight container at room temperature for up to a month or refrigerate for longer freshness.