In a slow cooker, combine cornstarch, rosemary and 1/4 tsp. each salt and pepper. Add beef and toss to coat. Stir in shallots, potatoes, carrots, celery, mushrooms, tomatoes, chicken broth and Worcestershire sauce. Cover and cook on low until meat and vegetables are tender, 5 to 6 hours.
Using a slotted spoon, transfer beef and vegetables to bowls. Carefully pour sauce from slow cooker into a fat separator. Pour skimmed sauce over meat; discard fat. Sprinkle with parsley and serve.