A crunchy sugar coating tops juicy grapefruit halves for a tangy-sweet textural delight. This recipe comes from "Martha's Entertaining."
Preheat oven to 250 degrees. Wash and dry blood orange, then use a serrated knife to slice off four thin rounds. Arrange on a baking sheet lined with a nonstick baking mat; dust liberally with confectioners' sugar. Cook until completely dry, flipping halfway through, about 45 minutes. Let cool completely.
Heat broiler, with rack 6 inches from heat. Halve grapefruits; loosen segments from membranes with a knife, keeping halves intact. Broil until browned in spots on top, 2 to 3 minutes. Top each half with a blood orange slice and dust with confectioners' sugar. Serve immediately.