1 to 1 1/2 lb. ground chuck
1 med. onion, chopped
2 to 3 tbsp. barbecue sauce
1/4 c. ketchup
1 tbsp. mustard

Brown ground chuck and drain off fat. Add onion, barbecue sauce, ketchup and mustard. Cook covered on low for 15 minutes. Serve on toasted buns.