According to Jean-Michel Carton, the owner of Artisan Boulanger-Pâtissier Carton Paris ( 6 Boulevard De Denain, 75010) and the winner of this year’s “best croissant in Paris”, a perfect croissant has to have… A perfectly browned shell, with the central leaf “la couleurette” slightly darker than the rest, each “feuilletage” pastry…