Newly minted Michelin-starred chef Arturo Rivera Martínez stood over a hot grill Wednesday at the first Mexican taco shop ever to get a coveted star from the French dining guide. El Califa de León is the only taco shop among the 16 Mexican restaurants given one star, as well as two eateries that got two stars. Almost all the rest are posh eateries. (AP Video by Fernanda Pesce) (May 15)