Ingredients

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 

Preparation

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.