Barbecue Sauce

1 small onion, chopped
1 c. ketchup
3 Tbsp. lemon juice
3 Tbsp. Worcestershire sauce
1 1/2 tsp. ground mustard
1/8 tsp. cayenne pepper
2 Tbsp. butter
1/4 c. brown sugar
2 Tbsp. cider vinegar
1 tsp. celery seed

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