In a large saucepan, cook the beef, onion, celery and carrot over medium heat until meat is no longer pink; drain. , Add the water, au jus mix, bouillon, bay leaves and pepper; bring to a boil. Stir in the noodles. Return to a boil. Cook, uncovered, for 15 minutes or until noodles are tender, stirring occasionally. Discard bay leaves.