Carefully pour room temperature Red Bull into a bowl and leave to stand until the foam has dissolved. Meanwhile soak 5 sheets of gelatine in cold water. Sort the berries. Cut 550 g lemon cake into slices (about 1.5 cm thick). Line a square springform pan (24 x 24 cm) with it. Heat 3 tablespoons of Red Bull in a small pot, dissolve gelatine in it while stirring.
Stir the gelatine mixture into the Red Bull and chill (20-30 minutes) until it starts to gel. In the meantime, soak 7 sheets of gelatine. Finely puree 150 g berries and sugar with approx. 3 tablespoons of water. Mix berry puree with quark. Heat 3 tablespoons of berry quark in a small pot. Dissolve gelatine in it while stirring. Mix some berry quark with the gelatine mixture. Stir the gelatine mixture into the berry quark. Also refrigerate until the mixture begins to gel. In the meantime spread approx. 200 g berries on the lemon cake base. Add the gelling Red Bull and chill. When the berry quark starts to gel, whip the cream until stiff, fold it into the quark and spread it also smooth on the cake.
Stir the gelatine mixture into the berry quark. Also refrigerate until the mixture begins to gel. In the meantime spread approx. 200 g berries on the lemon cake base. Add the gelling Red Bull and chill. When the berry quark starts to gel, whip the cream until stiff, fold it into the quark and spread it also smooth on the cake. Chill the cake for at least 3 hours. Remove the cake, divide into 10 slices and decorate with the remaining berries. Crumble the rest of the cake and sprinkle over it