Instructions
- Preheat oven to 400°.
- Peel both oranges and the grapefruit; discard the peels. Slice all the cirtus fruits into thin rounds (about 1/4" thick). Place the citrus rounds on an ungreased baking sheet, overlapping the edges just a bit.
- In a small bowl, combine the brown sugar and cinnamon and stir until thoroughly blended. Place about a teaspoon of the sugar mixture on the top of each citrus round. Using the back of the spoon, spread the sugar mixture evenly over the top of the citrus rounds.
- Bake in the oven (at 400°) for about for 5 or 7 minutes, or until the fruit slices are heated through.
- Serve immediately, while the fruit slices are still warm.