1 lb. ground beef
1 c. chopped green peppers (opt.)
1 tbsp. vinegar
1 c. ketchup
1 c. chopped onions
1/2 tsp. sugar
2 tbsp. mustard
1 tsp. salt
6 to 8 hamburger buns

Brown ground beef, add remaining ingredients except buns. Cover and simmer for 30 minutes. Serve on warmed buns.