1/2 c. celery, cut up
1 med. onion
2 tbsp. mustard
2 tbsp. brown sugar
1 c. catsup
1/2 c. water
1 tbsp. Worcestershire sauce
2 tbsp. vinegar

Brown celery and onion in 2 tablespoons shortening. Add to celery and onion. Add 2 cans roast beef or as much left over roast beef, pork or chicken. Simmer slowly until thick. Serve on buns.