Gratin di Patate alla Fontina (Italian Potato Gratin) Story of the Dish This Alpine style potato gratin combines thinly sliced potatoes with Fontina, Parmigiano Reggiano, cream, milk, garlic and nutmeg. It is designed around contrast, tender defined layers underneath and a deeply browned cheese crust above. Fontina, traditionally associated with Valle d’Aosta, melts exceptionally well and brings nuttiness, creaminess and savory depth. The objective is not a loose casserole sw