In a medium saucepan, add blackberries, brown sugar, and apple cider vinegar. Cook on medium heat for 5–7 minutes.
Mash the berries using a spoon or potato masher until juicy.
Add ketchup, honey, Worcestershire sauce, garlic, and all the remaining spices.
Bring the sauce to a simmer and cook over a low flame for 10–12 minutes, until it has thickened.
Once thick, use a fine-mesh strainer to remove seeds if you prefer a smooth sauce.
Let it cool, then transfer it to a clean jar or bottle.
That’s it, your homemade blackberry BBQ sauce recipe is ready to be used with ribs, chicken, or grilled veggies.