APPLE BUTTER BBQ SAUCE

Makes about 2 cups.

1 onion, minced
16 oz. jar apple butter
3/4 c. cider vinegar
3 tbsp. brown sugar
4 tbsp. mustard
1/2 tsp. celery seed
1/2 tsp. salt
1/2 tsp. pepper

Combine all in saucepan. Bring to boil, stirring frequently. Use on chicken, pork, burgers. Stores well in refrigerator.