Barbecue Sauce
["1/2 c. margarine", "1 c. ketchup", "1/2 c. water", "1 medium onion, thinly sliced", "2 Tbsp. sugar", "2 Tbsp. vinegar", "2 Tbsp. Worcestershire sauce", "1 tsp. chili powder", "salt to taste"]
["Bring ingredients to a boil.", "Reduce heat; simmer for 15 minutes."]
["margarine", "ketchup", "water", "onion", "sugar", "vinegar", "Worcestershire sauce", "chili powder", "salt"]