Line a springform pan (26 cm Ø; with a high rim) at the bottom with baking paper. Preheat the oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). Separate eggs. Beat the egg whites and 1 pinch of salt until stiff, adding 100 g sugar.
Beat the egg yolks separately. Mix flour, starch and baking powder, sieve over it and fold in.
Put the sponge mixture into the mould and smooth it down. Bake in a hot oven for 18-20 minutes. Let them cool down.
Drain the apricots. Soak the gelatine in cold water for about 10 minutes. Mix quark, vanilla sugar, lemon juice and 75 g sugar. Squeeze the gelatine well and dissolve at very low heat. First stir in 3 tablespoons of cream, then stir into the rest of the quark cream.
Chill for 20-30 minutes until the cream begins to gel.
Whip cream until stiff and fold into the gelling cream. Cut the cake base once. Place the rim or cake ring around the bottom cake base. Spread about 1/3 of the cream on the bottom cake layer.
Place the apricots on top with the convexity upwards. Spread the rest of the cream on top. Place the 2nd base on top. Chill the cake for at least 4 hours. Remove the cake from the cake ring and dust with icing sugar.