Sloppy Joes

1 pound lean ground beef
1 (8 ounce) can tomato sauce
1/2 cup onion, chopped
1/4 cup catsup
1 tablespoon granulated sugar
1 1/2 teaspoons Worcestershire sauce
1 tablespoon vinegar
1/2 green bell pepper, chopped
In skillet, brown meat with pepper and onion; pour off fat. Add remaining ingredients except buns; bring to a boil. Reduce heat; cover and simmer 15 to 20 minutes.
Serve on buns.