(FILES) A picture taken on March 4, 2015 in Paris shows a ham sandwich, "Jambon-Beurre" sandwich (ham and butter), on the zinc counter of a bar. From the zinc counters of bistros to the windows of luxury hotels: in Paris, the ham and butter sandwich, a sandwich for broke and hurried workers, has transformed in recent years into a gourmet, even luxurious, object, both a fetish and a tourist trap. Before being called "le parisien", the ham and butter sandwich was known in the capital as "casse-croûte". (Photo by LOIC VENANCE / AFP via Getty Images)