Beat the fat, sugar and 1 packet of vanilla sugar until creamy. Separate the eggs. Add the egg yolks one after the other. Stir in semolina and starch. Add quark, lemon juice and zest and mix.
Beat the egg whites until stiff and fold into the curd mixture. Grease a springform pan (26 cm Ø) and sprinkle with semolina. Put the quark mixture into the mould and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: not suitable/ gas: level 2) for 60-70 minutes.
Take out the cheesecake, remove the cake edge from the edge of the mould with a knife, let it cool down a little. Remove the edge of the springform pan and let the cake cool down. Whip the cream until stiff and allow the remaining vanilla sugar to trickle in.
Spread plum jam on the cheesecake, spread cream on top. Sprinkle with almonds and dust with icing sugar.