BBQ Sauce

Prep Time: 5 minutes | Cook Time: 15 minutes | Serves: 8 Ingredients : 2 tablespoons butter 1/2 cup diced onion 1/2 cup ketchup 1/2 cup brown sugar 1/4 cup apple cider vinegar 1/4 cup Worcestershire sauce 1 teaspoon garlic powder 1 teaspoon paprika 1/2 teaspoon ground black pepper 1/2 teaspoon mustard