01 - Season the beef cubes with salt and pepper, then toss with the flour until coated.
02 - In a large skillet over medium-high heat, heat the olive oil. Brown the beef in batches until all sides are seared. Transfer to the slow cooker.
03 - Add the carrots, potatoes, celery, onion, and garlic to the slow cooker.
04 - In a bowl, whisk together the beef broth, red wine (if using), tomato paste, and Worcestershire sauce. Pour over the beef and vegetables.
05 - Add the bay leaves, thyme, and rosemary. Stir gently to combine.
06 - Cover and cook on low for 8 hours, or until the beef and vegetables are tender.
07 - In the last 30 minutes of cooking, add the frozen peas. Adjust seasoning with salt and pepper as needed.
08 - Remove bay leaves before serving. Serve hot, garnished with fresh parsley if desired.