Pork Barbecue
["1/2 tsp. chili powder", "1/2 tsp. celery salt", "1/2 tsp. onion salt", "1 Tbsp. vinegar", "1 Tbsp. butter (margarine)", "1 small bottle catsup", "1 bottle water (after the catsup is emptied)", "3 lb. pork roast, cooked and shredded"]
["Mix all ingredients, except pork, and simmer 1/2 hour or until thick.", "Pour over pork which has had fat removed.", "Stir and simmer 15 to 20 minutes.", "Serve on hamburger buns."]
["chili powder", "celery salt", "onion salt", "vinegar", "butter", "catsup", "water", "pork roast"]