01 - Preheat oven to 300°F. Pat the lamb thoroughly dry with paper towels and place in a large roasting pan.
02 - In a small mixing bowl, combine minced garlic, lemon zest and juice, chopped oregano, olive oil, sea salt, and black pepper. Stir until well incorporated.
03 - Rub the marinade generously over the entire surface of the lamb, working it into any natural crevices and making shallow incisions to allow flavor penetration.
04 - Place halved potatoes, onion wedges, and carrot chunks evenly around the lamb in the roasting pan.
05 - Pour the broth and white wine into the bottom of the pan around the vegetables and meat.
06 - Cover the roasting pan tightly with aluminum foil. Roast in the preheated oven for 2.5 hours.
07 - Remove the foil and increase oven temperature to 400°F. Continue roasting uncovered for 30 minutes until the lamb develops a golden-brown crust and reaches desired tenderness.
08 - Transfer the lamb to a cutting board and let rest, loosely covered with foil, for 15 minutes before carving. Serve slices with the roasted vegetables and pan juices.