Separate eggs. Beat the egg whites until stiff, then pour in 100 g of sugar. Fold the egg yolks into the beaten egg white. Mix flour, starch and baking powder, sieve over the mixture and fold in. Grease the bottom of a springform pan (26 cm Ø). 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 20-25 minutes.
Remove the cake from the oven, remove from the edge and let it cool down on a cake rack. Soak gelatine in cold water. Mix quark, yoghurt, vanillin sugar, 125 g sugar and 4 tbsp lemon juice with the whisks of the hand mixer. Squeeze out the gelatine and melt at low heat. Stir in 4-5 tbsp. quark cream, then stir into the remaining quark cream. Chill the cream for about 5 minutes until it begins to gel. Whip cream until stiff and fold in portions. Spread the cream loosely on the base in the springform pan and refrigerate for about 4 hours. In the meantime peel and quarter the apples and cut out the core. Cut apples into thin slices and sprinkle with 3 tbsp. lemon juice. Melt butter in a pan at low heat. Add apple slices and steam for about 3 minutes, remove and let cool.
Whip cream until stiff and fold in portions. Spread the cream loosely on the base in the springform pan and refrigerate for about 4 hours. In the meantime peel and quarter the apples and cut out the core. Cut apples into thin slices and sprinkle with 3 tbsp. lemon juice. Melt butter in a pan at low heat. Add apple slices and steam for about 3 minutes, remove and let cool. Place the apple slices fan-like close together on the cake. Mix the cake glaze and 3 tbsp. sugar in a small pot and gradually stir in the apple juice and grenadine syrup. Bring to the boil while stirring. Let the glaze rest for 1 minute, then spread it evenly over the fruit from the middle of the cake. Chill the cake for about 1 hour. Remove from the springform pan and cut into pieces
Place the apple slices fan-like close together on the cake. Mix the cake glaze and 3 tbsp. sugar in a small pot and gradually stir in the apple juice and grenadine syrup. Bring to the boil while stirring. Let the glaze rest for 1 minute, then spread it evenly over the fruit from the middle of the cake. Chill the cake for about 1 hour. Remove from the springform pan and cut into pieces
Waiting time approx. 5 hours