Slow Cooker Barbecue Beef

1 boneless beef sirloin tip roast (about 3 pounds), cut into large chunks
3 celery ribs, chopped
1 large onion, chopped
1 medium green pepper, chopped
1 cup ketchup
1 can (6 ounces) tomato paste
1⁄2 cup packed brown sugar
1⁄4 cup cider vinegar
3 tablespoons chili powder
2 tablespoons lemon juice
2 tablespoons molasses
2 teaspoons salt
2 teaspoons Worcestershire sauce
1 teaspoon ground mustard
8 to 10 sandwich rolls, split

Place beef in a 5-quart slow cooker. Add the celery, onion and green pepper. In a bowl, combine the ketchup, tomato paste, brown sugar, vinegar, chili powder, lemon juice, molasses, salt, Worcestershire sauce and mustard. Pour over beef mixture. Cover and cook on low for 8-9 hours or until meat is tender.

Skim fat from cooking juices if necessary. Shred beef. Toast rolls if desired. Use a slotted spoon to serve beef on rolls.

Yield: 8-10 servings.