Slow Cooker Barbecue Beef
["3 lb. boneless tip roast, cut in chunks", "3 celery ribs, chopped", "1 large onion, chopped", "1 medium green pepper, chopped", "1 c. ketchup", "1 (6 oz.) can tomato paste", "1/2 c. packed brown sugar", "1/4 c. cider vinegar", "3 Tbsp. chili powder", "2 Tbsp. lemon juice", "2 Tbsp. molasses", "2 tsp. salt", "2 tsp. Worcestershire sauce", "1 tsp. ground mustard", "8 to 10 sandwich rolls"]
["Place beef in a 5-quart slow cooker. Add 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 8 to 9 hours or until meat is tender. Makes 8 to 10 servings."]
["celery", "onion", "green pepper", "ketchup", "tomato paste", "brown sugar", "cider vinegar", "chili powder", "lemon juice", "molasses", "salt", "Worcestershire sauce", "ground mustard", "sandwich rolls"]