1. Cut each grapefruit in half crosswise. Remove any pits and cut around each section with a sharp knife. 2. Sprinkle each grapefruit with 1 teaspoon sugar. 3. Dot each half with 1/2 teaspoon of butter. Place grapefruit halves on a paper plate. 4. Heat, uncovered, in Microwave Oven 4 minutes. 5. Garnish each half with a maraschino cherry. 6. Serve hot.