Separate eggs. Beat the egg whites and 4 tablespoons of water until stiff, add 125 g of sugar at the end. Add bitter almond flavour. One after the other, fold in the egg yolks. Mix flour, 100 g starch and baking powder, sieve onto the egg foam.
Add the almonds and carefully fold everything in. Line the bottom of a springform pan (26 cm Ø) with baking paper. Fill in sponge cake mixture and smooth it down. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for 30-35 minutes.
Let the sponge cake cool down on a cake rack. Crumble meringue. Drain the cherries, collect the juice. Stir the rest of the cornflour and 7-8 tablespoons of cherry juice until smooth. Boil up the rest of the juice, 30 g sugar, vanillin sugar and cinnamon stick.
Remove the cinnamon, stir the cornstarch into the juice and bring to the boil briefly. Add the cherries and let it cool down a little. In the meantime, cut the sponge twice and sprinkle the cake with liqueur. Place a cake ring around the lower cake base.
Spread cherry compote over it. Cover with the 2nd base and refrigerate for about 1 hour. For the cream, wash the lemons thoroughly and finely grate the peel. Squeeze the lemons. Mix mascarpone, sour cream, rest sugar, lemon juice and zest.
Whip the cream until stiff, allowing the cream firmer to trickle in. Mix cream and cream and pour a good 1/3 onto the second sponge cake base. Smooth and cover with the last cake base. Remove the cake from the edge with a knife and remove the cake ring.
Spread the rest of the cake all around with the remaining cream, sprinkle with meringue and press down lightly. Put the cake in a cool place for about 2 hours (no longer than 1/2 day, otherwise the meringue crumbs will dissolve) and serve dusted with icing sugar.