The mille-feuille, its actually a french word which means a thousand leaves. Its a vanilla slice, custard slice, also known as the Napoleon, is a French pastry of which the exact origin is unknown. Its modern form was influenced by improvements of Marie-Antoine Carême.Traditionally, a mille-feuille is made up of three layers of puff pastry (pâte feuilletée), alternating with two layers of pastry cream (crème pâtissière), but sometimes whipped cream or jam are substituted. The top pastry layer is dusted with confectioner's sugar, and sometimes cocoa, pastry crumbs, or pulverized seeds (e.g. roasted almonds). Alternatively the top is glazed with icing or fondant in alternating white (icing) and brown (chocolate) stripes, and combed.

raditionally, a mille-feuille is made up of three layers of puff pastry, and two layers of crème pâtissière. The top layer is coated with a sprinkling of powdered sugar.[2] In later variations, the top is glazed with icing, in alternating white (icing) and brown (chocolate) strips, and then combed. Today, there are also savory mille-feuille, with cheese and spinach or other savory fillings.