For the chocolate mousse cake, first melt 50g of white chocolate over a water bath. In the meantime, separate two eggs. Beat the egg whites with the sugar until stiff. In another bowl, cream the butter with the pulp of a vanilla bean.
Add the egg yolks and the liquid chocolate and mix well. Then fold in the beaten egg whites and the sifted flour and cocoa powder.
Pour into a small springform pan and bake at 180°C for about 8-10 minutes. Test with a chopstick if the dough is cooked through. Let cool well.
For the mousse layers, melt the dark chocolate and soak the gelatine (1 sheet) in water. Then whip 100 ml of whipped cream until stiff.
Beat the egg over a bain-marie until foamy and add the gelatine. Fold in the melted chocolate. Remove from the hot stove and add the whipped cream. Stir gently to combine.
Pour into the springform pan on the cooled cake base and refrigerate. When the mixture has set, repeat the same process with the milk chocolate.
Finally, melt the white chocolate over a water bath and soak the gelatin. Whip the whipped cream until stiff and mix the egg yolks over a water bath until foamy.
Add the gelatin and add the white chocolate. Remove from the heat again and fold in the whipped cream. Chill the chocolate mousse cake and serve.