Whisk the egg yolks, vanilla sugar and sugar with the whisk of the hand mixer until thick and creamy white. Stir in chestnut cream. Whip cream until stiff and fold in portions. Pour into a metal bowl and place in the freezer for 40-45 minutes
Roughly chop the chocolate, melt it over a warm water bath and let it cool down a little. Add the chocolate, up to approx. 1 1/2 tbsp. for decoration, to the chestnut cream while stirring
Pour into 8 cup cake cups (each containing 100 ml). Sprinkle one after the other with the remaining chocolate and lightly infuse with a wooden stick. Place in the freezer for another 3 hours
waiting time approx. 3 1/2 hours