1 lb. ground beef
1/2 c. onion, chopped (1 sm.)
1/3 c. catsup
1 tbsp. brown sugar
2 tsp. vinegar
1 tsp. mustard
1/2 tsp. Worcestershire sauce
4 to 6 hamburger buns
1 (#802) 2-qt. casserole set
1 (#808) steamer-colander

Combine onions and raw ground beef in steamer/colander. Place into 2-quart casserole. Cook 3 minutes at 100% power. Stir. Cook 3 more minutes at 100% power. Let drain. Remove excess "gunk" before second 3 minutes. Remove all "Gunk" from casserole; rinse or wipe out. Pour meat mixture into casserole. Add all other ingredients. Blend well. Cook 3 minutes at 100% power. Serve on buns.