Homemade Sloppy Joes

1 lb. ground beef

1/2 cup chopped bell pepper or celery

1/2 cup chopped onion

1 Tbsp brown sugar

1 tsp dry mustard

1/4 tsp salt

1/8 tsp pepper

1/2 cup ketchup

1 Tbsp vinegar

1 Tbsp Worcestershire sauce

8 oz can tomato sauce

6 Sandwich buns

In large skillet, brown ground beef, green pepper and onion; drain well. Stir in remaining ingredients except buns. Cover and simmer 15-20 minutes, stirring occasionally.