Wash the orange well to remove any wax. Slice the orange into 1/4" slices. Discard the ends.

Add sugar and water to a wide pan. Bring to a boil then reduce the heat to medium-low so it's gently boiling. Add the orange slices in a single layer. Gently boil for 20 minutes then flip the orange slices. Continue to cook for an additional 20 minutes. At this point, the oranges may not be candied yet, so keep cooking them until they're translucent and the syrup thickens up, flipping every 5-10 minutes. It took me close to an hour for the orange slices to become translucent.

Remove orange slices to a cooling rack (it's a good idea to put a piece of wax paper underneath to catch any sugary drips). Leave until they've cooled and set. Slice them as needed to garnish your mini bundt cakes.

You can reserve the remaining orange flavored syrup to use in other recipes.