Stage 4 of the tour begins in Pinerolo at the base of then Alps, and Guillaume is having a day of indulgence. He visits Antica Pasticceria Castino, a beloved pastry shop which opened in 1925. This charming establishment is known for the Zurich cake, a chocolate delight filled with cream and nougat. After eating this delicious dessert, Guillaume is inspired to make another iconic cake from the region that is ‘as light as a feather’, the Gateau de Savoie.