Place the beef, potatoes, water, carrots, soup, onion, celery, Worcestershire sauce, browning sauce if desired, bouillon granules, garlic, sugar, salt and pepper in a 5- or 6-qt. slow cooker. Cover and cook on low until meat is tender, 6-8 hours., Combine cornstarch and cold water in a small bowl until smooth; gradually stir into stew. Cover and cook on high until thickened, 30 minutes. Stir in peas; heat through.