Baked grapefruit

Prepare 3 grapefruits as directed above. Then arrange grapefruit halves in a baking tin. Spoon 1 teaspoon sherry on to each grapefruit half, sprinkle with demerara sugar then dot the surfaces with 1oz (25g) butter cut in flakes. Bake in an oven heated to 400°F (200°C) or gas no. 6 for 15 minutes. Set in individual serving glasses and spoon over juices from the tin.