[citation needed] It is customary to dip the biscuit in champagne or red wine.

In order to hide them, the baker decided to add a natural color based on cochineal, a scarlet dye, to disguise his mistake.

Enthusiasts for the biscuit included King Charles X, Leopold II of Belgium, the Russian czar, and the Marquise de Polignac.

The original recipe of the famous "Biscuit Rose" is still kept secret by Fossier's confectioners.

Despite the basic ingredients that include eggs, sugar, flour, and vanilla, the traditional French recipe demands special mastery and daintiness.