Slow Cooker Beef Stew
  1. Layer potatoes, carrots, onions, and celery in a 5-qt slow cooker.
  2. Place flour in a large resealable plastic bag.
  3. Add stew meat; seal and toss to coat evenly.
  4. In a large skillet, brown meat in oil in batches.
  5. Place over vegetables.
  6. In a large bowl, combine the tomatoes, broth, dry mustard, salt, pepper, and gravy. Pour over beef.
  7. Cover and cook on high for 1-1/2 hours.
  8. Reduce heat to low; cook 7–8 hours longer or until meat and vegetables are tender (or cook on high for six hours).