Tangy Carolina-Style Barbeque Sauce

Ingredients

• 1 cup prepared yellow mustard
• 3/4 cup cider vinegar
• 1/2 cup brown sugar
• 1/4 cup white sugar
• 1/4 cup water
• 1/4 cup white vinegar
• 1 tablespoon chili powder
• 1 teaspoon ground black pepper
• 1 teaspoon ground white pepper
• 1/2 teaspoon cayenne pepper
• 1/2 teaspoon soy sauce
• 2 tablespoons salted butter
• 1 teaspoon liquid smoke flavoring