If there’s one reason to visit the South of France in winter, when despite the brilliant sunshine, it’s freezing cold from the Camargue to the Cote d’Azur, it’s truffles.   Fittingly for an area associated with luxury travel, this – particularly the area surrounding the picturesque town of Uzès –  is one of the most prolific hunting grounds in the world for tuber melanosporum, as the black truffle of winter is known.