My mom used to make this when we were younger as a quick weeknight dessert. We loved it. It was juicy, sweet, tart and also fun to eat. It was like a scavenger hunt, scraping all the last bits of sweet nectar from the bottom of the grapefruit. My mom crumbled some brown sugar on top and microwaved it. It was still delicious, but I wanted to give it a deeper, smokier flavor. I broiled it in the toaster oven instead and it was great! I think any citrus would work, orange would be especially lovely too. I also sprinkled some sea salt before serving because I was craving a sweet salty flavor. Give this a try as an easy dessert, snack or even breakfast.
Just slice the grapefruit in half, crumble brown sugar over the entire exposed grapefruit and put under the broiler for 10-15 minutes or until caramelized.