Tangy Barbecue Sandwiches
3 cups chopped celery
1 cup chopped onion
1 cup ketchup
1 cup Taste of Texas BBQ Sauce
1 cup water
2 tbs white vinegar
2 tbs Worcestershire sauce
2 tbs brown sugar
1 tps chili powder
1 tps salt
1/2 tps pepper
1/2 tps garlic powder
1 boneless beef chuck roast (3 to 4 lbs), trimmed and cut in half
18 hamburger buns, split