01 - Pat beef cubes dry with paper towels and season generously with salt and pepper.
02 - Heat a large skillet over medium-high heat. Brown beef in batches, developing a rich crust on all sides. Transfer browned meat to the slow cooker.
03 - Add carrots, potatoes, celery, onion, and garlic to the slow cooker with the beef.
04 - Whisk together beef broth, red wine, tomato paste, Worcestershire sauce, thyme, and rosemary until well combined.
05 - Pour the broth mixture over the meat and vegetables. Add bay leaves. Cover and cook on low for 7–8 hours or on high for 4–5 hours, until beef and vegetables are tender.
06 - Discard the bay leaves from the stew.
07 - Mix cornstarch and cold water to form a smooth slurry. Stir into the stew, add frozen peas, and cook on high for 15–20 minutes until thickened and peas are heated through.
08 - Taste the stew and adjust salt and pepper as needed before serving.