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.
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