01 - Pat the beef cubes dry with paper towels and season with salt and pepper.
02 - Place 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. Pour over the meat and vegetables.
04 - Gently stir to combine all ingredients in the slow cooker.
05 - Cover and cook on low for 8 hours, or until beef and vegetables are tender.
06 - In the last 30 minutes of cooking, mix cornstarch with cold water to create a slurry. Stir into the stew to thicken.
07 - Remove bay leaves before serving. Taste and adjust seasoning if needed.