Melt butter in a pot. Grind the biscuits in the universal chopper. Mix butter and biscuits. Spread the bottom of a springform pan (20 cm Ø) with oil. Spread the crumble mixture evenly on it and press it down
Soak gelatine in cold water. Sort the raspberries and, except for a few for decoration, pass through a sieve. Wash the lemons hot, grate them dry and from one of them rub the rind thinly, halve the fruit and squeeze the juice. Whip 100 g cream until stiff and chill
Dissolve 3 sheets of gelatine and mix with 2 tablespoons of raspberry puree. Then stir into the remaining raspberry puree. Mix cream cheese, quark, sugar, lemon juice and rind. Squeeze 6 sheets of gelatine, dissolve and mix with 1-2 tbsp. cream cheese cream. Then stir into the remaining cream and fold in half of the cream
Halve the mixture and fold the raspberry puree into one half. Spread the mixture alternately into the springform pan, swirl lightly and chill for at least 6 hours, preferably overnight.
Wash the lemon balm, shake dry and pluck the leaves from the stalks. Cut 4 slices from the remaining lemon and halve them. Remove the cake from the tin. Whip the rest of the cream until stiff and fill into a piping bag with star-shaped spout. Spray tuffs onto the cake and decorate with raspberries, lemon slices and lemon balm. Place the remaining raspberries in the middle of the cake
waiting time approx. 6 hours