Line a springform pan (26 cm Ø) at the bottom with baking paper. Preheat the oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). Separate the eggs. Beat the egg whites and 3-4 tbsp. cold water until stiff, adding 150 g sugar.
Beat the egg yolks separately. Mix flour, 50 g starch, 30 g cocoa and baking powder, sieve over it and fold in. Smooth the sponge cake mixture in the mould. Bake in a hot oven for about 30 minutes and let it cool down.
For the chocolate rolls, chop the couverture and melt in a hot water bath. Spread on a cold, smooth surface (e.g. marble board or the back of a baking tray). As soon as it begins to set, remove with a spatula in long shavings.
Remove the sponge cake from the tin, remove the baking paper and cut the base twice horizontally. Place a cake ring around the lower cake base. Sprinkle each cake base with 4 tablespoons of kirsch.
For the compote, drain the cherries and collect the juice. Stir 35 g starch and 5 tbsp cherry juice until smooth. Boil up the remaining juice and 2 tbsp. sugar. Stir in starch and simmer for 2-3 minutes. Fold in the cherries, let cool down briefly.
Spread on the lower floor. Let it cool down.
Whip 500 g cream until stiff, adding 1 tablespoon of sugar, 2 vanilla sugars and 2 cream stabilisers. Spread about 1/3 of the cream on the cherries and place the 2nd cake layer on top. Spread the rest of the cream on top and place the 3rd base on top.
Put the floor on top. Chill for at least 4 hours.
Whip 300 g cream, 1 vanilla sugar and 1 cream firming agent until stiff. Remove the cake from the cake ring, spread with cream all around. Chill for at least 2 hours. Dust with 1 tbsp. cocoa and decorate with the chocolate rolls.