01 - Set the oven to 425°F (220°C).
02 - Pat the lamb dry using paper towels and create several deep slits evenly across the surface with a sharp knife.
03 - In a small bowl, mix anchovy fillets, minced garlic, rosemary, thyme, black pepper, lemon zest, and olive oil into a coarse paste.
04 - Massage the anchovy-rosemary paste thoroughly over the lamb, pressing it into the slits and coating the exterior.
05 - Sprinkle coarse sea salt evenly over the lamb.
06 - Place the lamb on a rack set inside a large roasting pan. Pour white wine and chicken or lamb stock into the pan's base.
07 - Roast the lamb at 425°F (220°C) for 20 minutes to develop crust.
08 - Lower oven temperature to 350°F (180°C) and roast for an additional 1 hour 10 minutes or until the internal temperature reaches 135°F (57°C) for medium-rare doneness.
09 - Transfer lamb to a cutting board, loosely tent with foil, and let it rest for 20 minutes before carving.
10 - Skim excess fat from roasting pan liquids, then simmer over medium heat to slightly reduce if desired. Serve alongside lamb.