The story
Alteration of croustade.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A type of sauce made from milk and eggs (and usually sugar, and sometimes vanilla or other flavourings) and thickened by heat, served hot poured over desserts, as a filling for some pies and cakes, or cold and solidified; also used as a base for some savoury dishes, such as quiches, or eaten as a stand-alone dessert; egg custard. Full definition →
Alteration of croustade.
Etymology from Wiktionary, CC BY-SA 4.0.