Separate eggs. Beat the egg whites with 3 tbsp. water and salt until stiff, adding 60 g sugar. Add the egg yolks briefly. Mix flour, cocoa and baking powder, sieve and fold in. Pour the mixture into a springform pan (26 cm Ø) covered with baking paper at the bottom and smooth it down.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 15 minutes. Remove and let cool on a cake rack. Remove the sponge cake from the tin.
Meanwhile melt butter. Finely crumble the biscuits in a universal chopper. Mix with the butter. Pour into a springform pan (26 cm Ø) greased with oil and press to a flat bottom.
Chill for about 30 minutes.
Roughly chop the nuts. Heat 200 g cream. Caramelise 200 g sugar until golden brown. Add cream and simmer for about 5 minutes until the sugar is dissolved. Remove 4 tbsp. caramel and set aside.
Mix the nuts, except for 2-3 tbsp. for sprinkling, into the remaining caramel. Spread the nut-caramel on the biscuit base, leaving about 1 cm of edge free all around. Chill for about 15 minutes.
Soak gelatine in cold water. Mix quark, 60 g sugar and peanut cream. Whip 300 g cream until stiff. Squeeze the gelatine, dissolve carefully. Stir in 2-3 tbsp. quark cream, then stir into the remaining cream.
Fold in whipped cream. Spread cream on the nut-caramel layer. Place the sponge cake base on top and press down gently. Put it in a cold place.
Cut the chocolate into pieces. Melt over a warm water bath, let it cool down a little. Whip 300 g cream until stiff. Stir in 2 tablespoons of chocolate, fold everything into the remaining chocolate. Spread loosely on the sponge cake.
Chill the cake for about 2 hours.
Warm the rest of the caramel slightly. Remove the cake from the mould. Sprinkle with nuts and sprinkle with caramel. Cut the cake into pieces with an electric knife.