My mom used to make us baked grapefruit every once and awhile on cold, winter mornings or on special occasions. I've had an untouched grapefruit sitting in my fridge for almost a week now, so I decided to give it a shot today since its been particularly drafty in our house. All you need is a grapefruit cut in half and some brown sugar. Some say to add cinnamon, but I'm not a big fan. Just place the grapefruit halves on a cookie sheet—the juices tend to spill over—sprinkle a heaping tablespoon of brown sugar on top and bake at 350 degrees for about ten minutes or until the sugar is done caramelizing. Then devour it. Its really great with a cold dollop of yogurt on the side.
Photo from http://www.sweetsassafras.org/ (She has a really beautiful blog)