All-american barbecue sauce

2 tablespoons unsalted butter
2 medium onions, finely chopped
1/2 cup ketchup
6 tablespoons brown sugar
6 tablespoons Worcestershire sauce
1/4 cup prepared steak sauce
2 tablespoons cider vinegar
1/8 teaspoon hot pepper sauce

In medium-sized saucepan, heat butter over medium-low heat. Add onions and saute for 5 minutes, but do not allow them to brown. Stir in ketchup, sugar, Worcestershire sauce, steak sauce, vinegar, 1/2 cup water, and hot pepper sauce. Bring to a boil; reduce heat and simmer, stirring occasionally, for 20 minutes. Meanwhile, wash and sterilize 2 pint jars. To sterilize jars, put in a large saucepan and fill pan with hot (not boiling) water to 1 inch above the tops of the jars and boil 10 minutes; drain. Pour sauce into hot jars. Cap, cool, and freeze or refrigerate for 2 to 3 weeks.