Heat the olive oil in a large pot over medium heat. Add the lamb chunks and cook until browned on all sides, about 5 minutes.
Add the onion and garlic to the pot. Cook for 3 minutes until the onion begins to soften.
Stir in the carrots, parsnips, and potatoes. Cook for another 2 minutes.
Pour in the beef broth. Add the rosemary sprigs, salt, and black pepper.
Bring the mixture to a simmer, then cover the pot. Cook for 40 minutes, stirring once halfway through, until the lamb is tender and the vegetables are soft.
Remove the rosemary sprigs before serving.