Mrs. Dull'S Barbecue Sauce
["1/2 lb. butter", "2 qt. apple cider vinegar", "2 c. water", "1 Tbsp. Dijon mustard", "1 medium onion", "3/4 to 1 c. Worcestershire", "2 c. ketchup", "2 c. chili sauce", "juice of 2 lemons", "zest of 1/2 lemon peel, grated", "3 cloves garlic, crushed", "2 tsp. sugar"]
["Place all ingredients in a large pot or Dutch oven.", "Stir together and cook over medium heat for 30 minutes.", "Pour into sterile bottles or jars.", "Keep refrigerated."]
["butter", "apple cider vinegar", "water", "mustard", "onion", "Worcestershire", "ketchup", "chili sauce", "lemons", "garlic", "sugar"]