I know you're thinking that this sounds a bit weird, but it is delicious. I made it the other night for dessert and we all agreed that grapefruit tastes fantastic warmed up. It would be especially nice on a cold day. If you're interested in making baked grapefruit you'll need some cinnamon and brown sugar. First cut the grapefruit in half, then pre-cut the sections of the grapefruit. Sprinkle the grapefruit with cinnamon and brown sugar and bake for 20 minutes at 375. It is so yummy, give it a try.