top secret bbq sauce

Ingredients

• 36 ounces heinz ketchup (recommended brand for best results)
• 18 ounces water
• 1 1/2 teaspoons worcestershire sauce
• 1 1/2 teaspoons liquid smoke flavoring
• 3 teaspoons onion salt
• 1 1/2 tablespoons fresh minced garlic
• 3 tablespoons dried mustard powder
• 3 tablespoons yellow mustard
• 2 1/4 cups brown sugar, firmly packed
• 7 tablespoons lemon juice
• 1 tablespoon black pepper
• 1 tablespoon cayenne pepper
• 3 tablespoons white vinegar
• 1 1/2 sticks real butter