Separate eggs. Beat the egg white and 4 tbsp. water until stiff, adding 100 g sugar. Beat the egg yolks separately. Sieve flour, starch and baking powder and fold in. Pour into a springform pan (26 cm diameter) lined with baking paper at the bottom. Bake in the preheated oven (electric cooker: 200 °C / convection oven: 175 °C / gas: level 3) for about 20 minutes. Let it cool down
Whip 400 g cream until stiff, while pouring in 1 sachet of cream firming agent and vanillin sugar. Fold in liqueur
Dissolve the cappuccino powder in 6 tablespoons of hot water. Let it cool down. Whip 400 g cream until stiff, while adding 1 sachet of cream firming agent and 2 tbsp. sugar. Fold in cappuccino
Halve the sponge cake 1x horizontally. Fill half each of the advocaat and cappuccino cream into a piping bag with perforated spout (or into a piping bag one after the other). Spray alternate circles of advocaat and cappuccino cream onto the bottom base. Place the upper base on top. Decorate with remaining cream and chocolate decoration