1 lb. ground beef
1 med. onion, chopped
1/2 c. tomato catsup
1 tsp. Worcestershire sauce
1 tsp. vinegar
1 tsp. mayonnaise
1 tsp. mustard

Brown ground beef and onion. Then add rest of ingredients and let simmer 15 minutes. Salt to taste. Spread on oven warmed or steamed buns.