Separate eggs. Beat the egg whites and 4-5 tablespoons of cold water until stiff and finally add 150 g of sugar while stirring. Then fold in the egg yolks one after the other. Mix flour, 100 g starch, 30 g cocoa and baking powder, sieve onto the egg foam and fold in carefully. Line the bottom of a springform pan (26 cm Ø) with baking paper. Add the sponge mixture and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 30 minutes.
Let the sponge cake cool down in the tin on a cake rack for about 2 hours. In the meantime, roughly chop the chocolate coating and melt it on a warm water bath. Spread the couverture thinly on a marble board or an upside-down baking tray and let it set. Use a spatula to form rolls and chill. Remove the sponge cake from the tin, remove the baking paper and cut the base twice horizontally. Place a cake ring around the lower base. Sprinkle each base with 4 tablespoons of kirsch. Drain the cherries on a sieve, collecting the juice. Stir 35 g starch with 5-6 tablespoons of cherry juice until smooth. Boil up the rest of the juice and 2 tablespoons of sugar. Stir in the starch and bring to the boil again. Fold in the cherries and spread evenly on the bottom layer. Let it cool down.
Drain the cherries on a sieve, collecting the juice. Stir 35 g starch with 5-6 tablespoons of cherry juice until smooth. Boil up the rest of the juice and 2 tablespoons of sugar. Stir in the starch and bring to the boil again. Fold in the cherries and spread evenly on the bottom layer. Let it cool down. Whip 500 g cream until stiff, adding 1 tablespoon of sugar, 2 sachets of vanillin sugar and cream firming agent. Spread about 1/3 of the cream on the cherries and cover with the middle cake layer. Spread the rest of the cream on top and cover with the third base. Whip 300 g cream and 1 packet of vanilla sugar until stiff. Remove the cake from the cake ring and spread with the cream. Dust with 1 tablespoon of cocoa and decorate with chocolate rolls. Keep cool until serving
Whip 500 g cream until stiff, adding 1 tablespoon of sugar, 2 sachets of vanillin sugar and cream firming agent. Spread about 1/3 of the cream on the cherries and cover with the middle cake layer. Spread the rest of the cream on top and cover with the third base. Whip 300 g cream and 1 packet of vanilla sugar until stiff. Remove the cake from the cake ring and spread with the cream. Dust with 1 tablespoon of cocoa and decorate with chocolate rolls. Keep cool until serving
1 1/2 hours waiting time