Beef with Hot Sauce

3 lb beef chuck roast
1/2 cup chopped onion
1/2 cup chopped celery
1/2 cup chopped green pepper
water
1 1/2 cup ketchup
3 tablespoons hot taco sauce
2 tablespoons brown sugar
2 tablespoons vinegar
2 garlic cloves minced
1 bay leaf
1 teaspoon salt
1 teaspoon dry mustard
1 teaspoon chili powder
8 hamburger buns

Place meat, onion, celery and green pepper in Dutch oven; cover with water.

Cover tightly and cook slowly 2 1/2 to 3 hours or until tender.

Remove meat; cool, shred and return to cooking liquid.

Add ketchup, taco sauce, brown sugar, vinegar, garlic, bay leaf, salt, mustard and chili powder. Cook slowly 1 hour.

Remove bay leaf; serve on buns.