Pierre Herm is universally acknowledged as the king of French pastry with shops in Tokyo, Paris and London. He is the best, and has even been described as a couturier of pastry. This is a man at the top of his art and there is no question his macarons are in a league of its own. Macarons are the aristocrats of pastry; these brightly colored, mini meringues, daintily sandwiched together with gooey fillings, have become a holy grail for cookery fanatics...