Defrost raspberries at room temperature. For the sponge cake, separate the eggs. Beat egg whites until stiff. Add 100 g sugar, vanilla sugar and salt. Stir in the egg yolks. Mix flour and baking powder, sieve onto the egg cream and fold in. Line the bottom of a springform pan (26 cm Ø) with baking paper. Fill in sponge mixture and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 15 minutes. Let cool down on a cake rack. Remove the base from the tin and cut in half horizontally. Place a cake ring around the lower cake base
Soak gelatine in cold water. Puree the raspberries and pass through a sieve. Chill 2-3 tablespoons of raspberry puree. Mix the rest of the raspberry puree with quark, lemon juice and 175 g sugar. Squeeze the gelatine, dissolve carefully. Stir a little cream into the gelatine, then stir everything into the rest of the cream. Whip 250 g cream until stiff, fold into the cream
Spread the cream on the floor and smooth it down. Place the upper base on top and press down slightly. Chill for at least 6 hours, preferably overnight. Whip 400 g cream until stiff. Halve the cream and carefully stir in the cold raspberry puree under one half. If the colour should be a little stronger, stir in food colouring if necessary.
Remove the cake from the ring. Pour light cream into a piping bag. Spray large dots onto the cake and the rim, leaving a space in between. Pour raspberry cream into the bag and squirt into the spaces in between. This may leave gaps. Carefully spread the cream with a spoon until it is cloudy so that the cake is completely covered. Decorate with raspberries and mint
waiting time approx. 8 hours