Kansas City Style BBQ Sauce – Revolution Barbecue

Ingredients

• 2 tablespoons butter
• 1 small white onion, diced
• 2 cups ketchup
• 1/3 cup dark brown sugar
• 1/3 cup molasses
• 1/4 cup apple cider vinegar
• 1 tablespoon yellow mustard
• 1 tablespoon granulated garlic
• 1 tablespoon chili powder
• 1 teaspoon freshly ground black pepper
• 1/2 teaspoon cayenne pepper