BARBECUED HAMBURGER

1/2 c. catsup
1/3 c. brown sugar
2/3 c. water
2 tbsp. chopped onion
2/3 c. chopped celery
3 tbsp. prepared mustard
1 tbsp. flour
2 tsp. salt
1/2 tsp. pepper
2 lbs. hamburger

Brown hamburger and add rest of ingredients. Simmer 30 minutes and serve on buns.