The chefs of the heads of state discover the region of La Gruyère, in Charmey. July 15, 2015. © La Liberté/Thomas Delley

The chefs of the heads of state taste the specialities of the region of La Gruyère, in Charmey. July 15, 2015. © La Liberté/Thomas Delley

The chefs of the heads of state discover the tradition of the region of La Gruyère, in Charmey. July 15, 2015. © La Liberté/Thomas Delley

The chefs of the heads of state discover the fabrication of the famous Gruyère, in Charmey. July 15, 2015. © La Liberté/Thomas Delley

The chefs of the heads of state discover the fabrication of the famous Gruyère, in Charmey. July 15, 2015. © La Liberté/Thomas Delley

The chefs of the heads of state discover the fabrication of the famous Gruyère, in Charmey. July 15, 2015. © La Liberté/Thomas Delley