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


In a medium saucepan, heat oil over medium heat. Add onion and garlic; cook, stirring occasionally, until translucent, about 5 minutes. Stir in mustard powder and red-pepper flakes; cook 30 seconds.

Reduce heat to medium-low; stir in sugar, ketchup, Worcestershire, vinegar, molasses, and black pepper. Cook, stirring occasionally, until thickened, 5 to 10 minutes.