Roast Lamb Feast

Serves 8 Butterflied Leg of Lamb with Rosemary and Garlic 1/4 cup olive oil 1/4 cup minced fresh rosemary 8 garlic cloves, minced Kosher salt and ground black pepper 1 butterflied leg of lamb, 4 1/2 to 5 pounds Vegetables 4 tablespoons butter, divided 3 tablespoons olive oil, divided 2 1/2  pounds golden yellow potatoes,...