Use this spicy barbecue sauce on our BBQ Chicken Kabobs with Potatoes and Summer Squash.
Heat oil in a saucepan over medium heat. Add onion and garlic; cook, stirring, until translucent, about 3 minutes. Add cayenne, ginger, mustard, salt, and allspice; cook just until spices become very fragrant, about 2 minutes more.
Add tomato puree, Worcestershire, molasses, and vinegar. Bring to a boil. Reduce heat to low; simmer, stirring often, until slightly thickened, about 15 minutes. Season with pepper. Use immediately, or cool and refrigerate until needed, up to 1 week.