Separate eggs. Beat the egg whites until stiff, gradually adding 40 g sugar. Cream egg yolk, remaining sugar and salt and carefully stir into the beaten egg white. Sieve flour, starch and cocoa onto the egg cream and fold in with a whisk. Spread the sponge mixture on a baking tray lined with baking paper and bake in a preheated oven (electric cooker: 200 °C/ gas: level 3) for approx. 10 minutes. Sprinkle a damp tea towel with sugar and turn the sponge cake over.
Carefully remove the baking paper immediately. Wrap the sponge cake with the cloth. Drain the cherries. Whip the sour cream until creamy and allow the vanilla sugar to trickle in. Soak the gelatine in cold water. Squeeze well and dissolve carefully. Mix with cherry brandy and stir carefully into the sour cream. Whip the cream until stiff. Fold about 1/3 into the sour cream. Pour the rest of the cream into a piping bag with a star-shaped spout and put in a cool place. Halve the sponge cake lengthwise and spread both halves with the cream.
Mix with cherry brandy and stir carefully into the sour cream. Whip the cream until stiff. Fold about 1/3 into the sour cream. Pour the rest of the cream into a piping bag with a star-shaped spout and put in a cool place. Halve the sponge cake lengthwise and spread both halves with the cream. Spread cherries on top, except for 10 pieces for decoration. Roll up the sponge cake from the long side and put in a cool place for about 30 minutes. Then cut each roll into 5 pieces. Dust with icing sugar and decorate with cream tuffs. Put cherries on the tuffs and sprinkle with chocolate shavings. Arrange on a plate and serve
Spread cherries on top, except for 10 pieces for decoration. Roll up the sponge cake from the long side and put in a cool place for about 30 minutes. Then cut each roll into 5 pieces. Dust with icing sugar and decorate with cream tuffs. Put cherries on the tuffs and sprinkle with chocolate shavings. Arrange on a plate and serve