1. Arrange oven rack to the top third of the oven, usually in the second notch down from the top. Preheat the oven to broil. Line a baking sheet with foil or a silicone baking mat. Do not use parchment paper, it will burn.
2. Slice the top and bottom off of the grapefruit so it can sit flat on a surface. Cut the grapefruit horizontally (not from top to bottom) so you expose the segments in a circular pattern. Place the halves face down on several paper towels for 10 minutes to extract excess moisture. Use a paring knife to carve around and loosen each segment. Pat out any moisture that is released.
3. Place grapefruit halves on the prepared baking sheet and sprinkle each with ½ tablespoon coarse sugar. Broil for 5-8 minutes until the sugar is caramelized and golden brown. Sprinkle with a couple flakes of salt and serve immediately.

I love to top with plain Greek yogurt and granola!