Melt the butter together with the cacao mass.
Stir the marzipan with the sugar (1).
Gradually add the egg and the egg yolk.
Replace the butterfly blade with the beater in the beating machine and beat until light and airy.
Beat the egg white with the sugar (2) to stiff peaks and fold this into the egg yolk mixture.
Add the sifted flour and the cocoa powder in 3 parts.
Finally, mix in the butter mixture.