1 lb. lean ground beef
1 green pepper, chopped
1 onion, chopped
1 tbsp. vinegar
1 tbsp. mustard
1/2 c. ketchup
1 tbsp. sugar
1 tbsp. Worcestershire sauce
red pepper to taste
hamburger buns

In a large skillet, cook together beef, peppers and onions, stirring with a fork to break up meat, until meat is browned and vegetables are tender. Drain off excess drippings. In a small bowl, mix together remaining ingredients, except buns. Add to beef mixture in pan. Mix well; cook over low heat for 50 minutes, stirring occasionally.

Spoon on buns. Serve immediately.