This dish can be served for dessert or breakfast. If you find it more convenient, you may use a blowtorch to brûlé the cut grapefruit instead of using the broiler.
Adjust an oven rack so the grapefruit will be about 4 inches below the heating element. Preheat the broiler. Halve horizontally:
Remove any large seeds. If desired, snip out the tough centers. Loosen each section by cutting along the membranes and pith with a grapefruit knife or small serrated knife. Place the halves on a small rimmed baking sheet. Sprinkle each half with:
Broil the grapefruit until the tops begin to brown, about 5 minutes. Serve at once. If desired, garnish the centers of the grapefruit with: