tangy barbecue sandwiches

Ingredients For tangy barbecue sandwiches

• 3 c

  chopped celery
• 3-4 lb

  boneless chuck roast, trimmed
• 1/2 tsp

  garlic powder
• 1/2 tsp

  pepper
• 1 tsp

  salt
• 1 tsp

  chili powder
• 2 Tbsp

  brown sugar
• 2 Tbsp

  worcestershire sauce
• 2 Tbsp

  vinegar
• 1 c

  water
• 1 c

  barbecue sauce, prepared
• 1 c

  ketchup
• 1 c

  chopped onion
• 14-18

  hamburger buns