My family loves these stuffed sandwiches. Easy for entertaining makes enough for a crowd.
Stir together water, onion soup mix, and au jus mix in a slow cooker. Add beef, cover, and cook on High for 5 hours, or until tender. When the beef is tender, shred the meat with two forks, and continue cooking on Low 1 to 2 hours.
To serve, open the hoagie buns, and spoon meat mixture into the center. Sprinkle with mozzarella cheese and serve.
Per Serving: 559 calories; protein 25g; carbohydrates 71.1g; fat 18.2g; cholesterol 46.4mg; sodium 1341.9mg.