Process 100 g butter in pieces with 250 g flour, 75 g sugar, 1 packet of vanilla sugar, 1 egg and 1 pinch of salt to form a smooth dough. Wrap in foil and put in the fridge for about 30 minutes.
Melt 75 g butter. Process 125 g flour with 50 g sugar, 1 packet of vanilla sugar, 1 pinch of salt, cinnamon and melted butter into crumble. Put in a cool place.
Peel the apples, quarter them and remove the core, then cut into pieces and drizzle with lemon juice.
Roll out the shortcrust pastry on a floured work surface in a circle and line a springform pan (26 cm) with it. Pull the dough up about 4 cm at the edge. Prick the bottom several times.
Beat 100 g butter with 150 g sugar and 1 packet of vanilla sugar until frothy. Separate 3 eggs, stir in egg yolks one at a time. Stir in the quark, pudding powder and lemon zest. Beat the egg whites with a pinch of salt until stiff and fold in, also fold in the apples. Smooth on the floor. Spread the sprinkles on top. Bake in the preheated oven at 175 ° C (convection: 150 ° C) for about 1 hour. Decorate with apple wedges.