Kansas City Style BBQ Sauce

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1. 1Step 1: In a medium saucepan over medium heat, melt the butter. Add the onion and cook until softened, about 5 minutes. Add the garlic and cook for another minute.
2. 2Step 2: Add the ketchup, molasses, brown sugar, vinegar, mustard, chili powder, black pepper, and cayenne pepper, and whisk to combine.
3. 3Step 3: Bring to a boil, then reduce the heat to low and simmer until thickened, about 30 minutes, stirring frequently.
4. 4Step 4: Use a hand blender or carefully pour into a blender and puree until smooth. Let cool to room temperature. Use immediately or transfer to a clean jar with a lid and keep refrigerated for up to a month.
5. 5Step 5: Sterilize your jars as normal, pour the hot BBQ sauce into the hot jars, leaving a 1-inch headspace.
6. 6Step 6: Remove the air bubbles, wipe the jar rim, and top with the lids and screw bands.
7. 7Step 7: Process half-pint jars in a hot water bath or boiling water canner for 20 minutes.
8. 8Step 8: After the 20 minutes in the water bath canner, carefully remove the jars and place them on the countertop. Let cool overnight before checking the seals.