What is "mille-feuille"

n. A type of pastry made of several layers of puff pastry usually filled with cream or custard, and topped with icing or sugar.

The mille-feuille (, "a thousand leaves"), vanilla slice, custard slice, also known as the Napoleon, is a French pastry whose 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.