Preheat your oven to 375°F (190°C).
Season the beef with salt, pepper, and minced rosemary.
In a large roasting pan, arrange the carrots, parsnips, onion, and garlic.
Drizzle olive oil over the vegetables, then toss to coat.
Place the seasoned beef in the center of the pan on top of the vegetables.
Cover tightly with aluminum foil and roast for 2 hours.
After 2 hours, remove the foil and roast for an additional 30–45 minutes, until the beef is browned and vegetables are tender.
Let the beef rest for 10–15 minutes before slicing.