Butterflied leg of lamb Chosen for flavour and succulence this boneless lam b leg has been expertly butchered and marinated with a lamb stock, mint & cracked black pepper. Finished with a meaty butter and served with a rich lamb jus; Creating a roasting joint which delivers ultimate convenience as the joint is easy to cook and carve. M&S prime lamb is expertly selected and reared on native pastures, free to roam and forage on root vegetables. Always British.