Barbecue Sauce - cooking recipe

Ingredients

1 lb. hamburger
1 Tbsp. butter
salt and pepper
1 small onion
1 bottle ketchup
1 1/2 tsp. Worcestershire sauce
3 Tbsp. chili sauce
1 tsp. prepared mustard
1 tsp. celery salt
2 Tbsp. sugar to taste

Preparation

You can add 1 teaspoon vinegar.