Grease a springform pan (26 cm Ø). Separate the eggs. Cream the fat, 125 g sugar, vanillin sugar and 1 pinch of salt. Stir in the egg yolks one by one. Mix flour and baking powder, alternating with the milk and stir in portions
Spread half the dough into the mould. Beat the egg whites and 1 pinch of salt until stiff, adding 200 g icing sugar. Spread half of the beaten egg white slightly wavy on the dough. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 25 minutes. Cool down. Bake the rest of the dough and beaten egg white in the same way
Soak gelatine in cold water. Whip the cream until stiff. Mix quark, 100 g sugar and lemon peel. Squeeze the gelatine, dissolve over low heat, stir in the lemon juice. Then stir into the quark mixture. Fold in cream
Place a cake ring or springform pan rim around a cake base. Spread plum jam first, then curd cream on top. Place the second cake base on top. Chill for about 4 hours. Dust with icing sugar