Royal is a classic French dessert that is also known as trianon. The base of the cake is made from dacquoise—the crispy almond meringue that's topped with crunchy praline cream, usually consisting of melted chocolate, thin and crispy crêpe dentelle biscuits, and praline paste.

The cake is then topped with a thick layer of chocolate mousse. Finally, it can be dusted with cocoa or coated in a chocolate glaze. Not much is known about the origin of gâteau royal, but the dessert is found in many French pastry shops. The cake comes in a round or rectangular form.