01 - Pat the beef cubes dry with paper towels and season evenly with salt and pepper.
02 - Place seasoned beef, carrots, parsnips, potatoes, onion, and celery in the slow cooker.
03 - In a small bowl, whisk together tomato paste, garlic, thyme, rosemary, bay leaves, Worcestershire sauce, and beef broth until well combined.
04 - Pour the liquid mixture over the meat and vegetables. Gently stir to combine. Cover and cook on low for 8 hours, or until beef and vegetables are tender.
05 - In the last 30 minutes of cooking, mix cornstarch with cold water to create a slurry. Stir into the stew until thickened.
06 - Remove bay leaves before serving. Taste and adjust seasoning if needed.