Beef Barbecue Sauce

3 Tbs chop onion
2 Tbs fat
2 Tbs brown sugar
1 Tbs lemon juice
1 1/2 c ketchup
1 tsp dry mustard
1/2 c diced celery
1 c water or beef stock
1 tsp salt

Fry onion in fat.
Add remaining ingredients.
Simmer 1 hour.