01 - Pat the beef roast completely dry with paper towels. Generously season all sides with kosher salt and freshly ground black pepper, pressing the seasoning into the meat.
02 - Heat olive oil in a large skillet over medium-high heat. Sear the roast on all sides until deeply browned, approximately 4 minutes per side. Transfer the seared beef to the slow cooker.
03 - Arrange carrots, parsnips, potatoes, onions, celery, and garlic in the slow cooker, placing them around and beneath the beef roast.
04 - Whisk together beef broth, red wine, tomato paste, and Worcestershire sauce in a small bowl until smooth. Pour the mixture evenly over the beef and vegetables.
05 - Sprinkle dried thyme, rosemary, and bay leaves over the contents. Cover and cook on low for 8–9 hours or on high for 4–5 hours, until the beef is fork-tender and vegetables are fully cooked.
06 - Remove and discard bay leaves. Slice or shred the beef against the grain. Serve with vegetables and pan juices.