Dariole is a French dessert that dates back to medieval Europe. It's a small tart with a pastry shell and a filling of flavored milk and egg custard. Typical flavorings include sugar, butter, vanilla, rosewater, orange flower water, or cinnamon.
By the 18th century, darioles were little custard tarts prepared in molds that had fluted sides, and nowadays the word dariole refers not only to the dessert, but to the mold itself. After baking, it's recommended to sprinkle the top of dariole with powdered sugar.