Separate eggs. Beat egg whites and 1 tablespoon of water until stiff. Add 75 g sugar. Stir in egg yolk. Mix flour, cornstarch, baking powder and cocoa and fold in. Pour the dough into a springform pan (24 cm Ø) greased at the bottom.
Bake in the preheated oven (electric oven: 175 °C/ gas: level 2) for approx. 25 minutes. Take out and let cool down. Soak 4 sheets of gelatine. Mix quark and remaining sugar. Dissolve gelatine and stir in.
Whip 150 g cream until stiff, fold into the quark. Mix 2/3 quark and vanilla pulp. Place the rim of the mould around the sponge cake. Spread vanilla quark on top and refrigerate for about 1/2 hour. Soak the rest of the gelatine.
Washing, cleaning, pureeing strawberries. Add the puree, except for 2 tablespoons, to the remaining curd cheese. Squeeze the gelatine, dissolve and stir in. Spread on the vanilla layer. Chill for about 2 hours.
Whip the rest of the cream until stiff. Decorate cake with cream, strawberry puree and waffles.