Pierce lamb all over with knife and place one garlic clove in each of the 12 holes. Generously salt and pepper lamb, rub with chopped garlic and sprinkle with rosemary. Place in roasting pan and bake at 350º for approximately 2 1/2 hours. After baking, remove lamb from pan and keep warm.
Rosemary-Garlic Roast Leg of Lamb with Red Potatoes--An overnight rest allows the Provençal blend of herbs and garlic that dot this leg of lamb to infuse the meat. Arranging the potatoes cut side down in a single layer beneath the lamb guarantees maximum caramelization.