In a medium saucepan, whisk together the ketchup, apple butter, vinegar, water, brown sugar, Worcestershire sauce, mustard, smoked paprika, garlic powder, onion powder, cumin, and cayenne (if using).
Place the pan over medium heat and bring the mixture to a gentle simmer, stirring occasionally.
Reduce the heat to low and cook for 10–15 minutes, until the sauce thickens slightly and the flavors meld together.
Taste and adjust seasonings with salt, pepper, or additional vinegar for tang.
Use immediately or let the sauce cool completely before storing in an airtight container in the refrigerator for up to 1 week.
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Notes
Apple butters can vary in sweetness. Taste your bbq sauce and adjust the seasoning to suit your preferences. For instance, add more vinegar to make it tangy, or increase the cayenne for a spicy kick. You can also use less sugar for a less-sweet sauce.