Barbecue Sauce For Chicken
["1/4 c. cider vinegar", "1/2 c. water", "2 Tbsp. brown sugar", "1 Tbsp. prepared mustard", "1/4 tsp. salt", "1/4 tsp. black pepper", "1/4 c. lemon juice", "1 medium onion, sliced", "1 Tbsp. butter or margarine", "2 Tbsp. Worcestershire sauce", "1/2 c. ketchup"]
["In a medium saucepan, combine all the ingredients, except the ketchup.", "Bring mixture to a boil and cook it over moderately low heat for 20 minutes.", "The sauce should be thick.", "Stir in ketchup and remove sauce from heat."]
["cider vinegar", "water", "brown sugar", "mustard", "salt", "black pepper", "lemon juice", "onion", "butter", "Worcestershire sauce", "ketchup"]