rack with cooking spray; place on grill over hot coals. Place patties on rack, and cook 4 minutes on each side or to desired degree of doneness. Line bottom half of each bun with a lettuce leaf; top with a patty, tomato slice, onion rings, and top half of bun. Repeat procedure with remaining ingredients. 4 servings. NOTE: Sunburgers can be broiled. Coat a rack with cooking spray; place rack in a shallow roasting pan. Place patties on rack, and broil 10 cm from heat 6 minutes on each side or to desired degree of doneness. Per serving: 35 calories, 29.5 grams protein, 34.4 grams carbohydrates, 10.9 grams fat, 64 milligrams cholesterol, 316 milligrams sodium.