Whirl all in a blender until the berries are pureed.
Pour into a 1 quart glass measuring cup. Cover loosely with a microwave-safe plastic wrap, leaving a vent for steam.
Cook in a microwave oven at full power, stirring occasionally until berry mixture is reduced to 1 1/3 cups, about 8 minutes. Serve with anything barbecued.
Recipe by Ultimate BBQ Sauce Recipes! at http://www.bbq-sauce-recipes.com/fruit-based-bbq-sauces/246/blackberry-bbq-sauce/