Roast Lamb is one of those dishes that is never out of fashion. While it is an easy dish, I have seen many so called professionals try to prepare a roast with inferior cuts of lamb with "tasteless"results (but more money in their pocket in the short term). To prepare a really good roast you need a good quality leg of lamb, New Zealand lamb is best in early spring in the U.K., while of course in Summer good British lamb is excellent (early spring is far too early for the lamb season to be truly under way in the U.K., mutton is what your more than likely purchasing).