Cut baking paper the size of the cake pan and line the bottom of the pan with it. If no baking paper is at hand, grease with butter and dust with flour.
Grease the ring of the cake pan with butter and sprinkle with flour. To do this, take a spoonful of flour and sprinkle it on the greased cake ring. Then turn the cake ring with one hand and tap it lightly with the other hand so that the flour is distributed evenly.
Weigh all ingredients for the dough and put into separate bowls.Mix the flour with the cornstarch.Sift the cocoa over it and mix with the flour and cornstarch. Preheat oven to 360°F (~180°C). For electric ovens, top and bottom heat.
Separate egg yolks from whites and set aside in separate bowls.
Add 8 tablespoons of water to the egg whites.
Beat egg whites with a mixer until very stiff.
Mix the weighed sugar to the egg whites.
Bit by bit, mix in the egg yolks.
Gradually add the cocoa-flour-cornstarch mixture (again, using the sieve so it doesn't get crumbly).
Don't use the mixer, but rather just fold in.
Fill into the prepared cake tin.
Bake the cake in a pre-heated oven at 360°F (~180°C) for about 40 minutes.
Cover the cake pan with a cake rack (or a large plate) and turn the entire cake upside down so that the straight BOTTOM is now ON TOP.Let cool for a few hours or overnight (covered). When the cake has cooled, cut it into 3 layers with a cake cutter.
Before you start to fill the first layer, use a cake lifter or large plate to lift down the top two layers.
Drain the canned sour cherries through a sieve. Collect the juice in a bowl.
Now drizzle the bottom cake layer with Kirsch (cherry brandy/liqueur/schnapps) and/or the juice of the canned cherries. About 10-15 tablespoons per layer. The layer should get lots of the cherry flavor, but also not be drowned.
Spread the cherries evenly on the bottom layer.
Using a mixer, whip the whipped cream until stiff and spread about a quarter of the cream (i.e. 125ml) on the first layer.
Repeat the same with the middle layer: carefully lift onto the bottom layer (with the help of the cake rack/plate); drizzle with cherry liqueur/cherry juice, top with cherries and spread with about another quarter of the whipped cream.
Now carefully lift the remaining layer on top.You can, if you like, now spread a thin layer of currant jelly (red currant jelly) on top and on the sides. This will make the cake more moist. Spread another quarter of the whipped cream on top and on the sides.
To spread the chocolate sprinkles evenly on the edge of the cake, take the cake on the cake lifter or plate in one hand. In the other hand, take the chocolate sprinkles and sprinkle them on the sides of the cake.Hold the cake a little askew (but not too much), so that the sprinkles can be distributed more evenly.Finally, sprinkle the top evenly with chocolate shavings. With a cake syringe or piping bag, place about 12 to 16 small dots of whipped cream (cream puffs) at the edge of the cake.
Place a candied cherry (or sour cherry) on each dollop of cream and you have a masterpiece!