Homemade Barbecue Sa

Homemade Barbecue Sauce: 1 tablespoon olive oil 1 small onion, finely chopped 4 garlic cloves, minced 1 tablespoon mustard powder 1 teaspoon red-pepper flakes 3 tablespoons light-brown sugar 2 cups ketchup 1/3 cup Worcestershire sauce 1/3 cup cider vinegar 1 tablespoon molasses 1/4 teaspoon ground black pepper