Knead flour, 120 g sugar, 240 g soft butter and cocoa into crumbles. Grease a springform pan (26 cm Ø) and dust with flour. Put half of the crumbles into the form and press it firmly. Drain the cherries well. Cream 120 g butter in pieces, 150 g sugar, 1 packet vanilla sugar and 1 pinch of salt with the whisks of the hand mixer.
Separate the eggs. Stir the egg yolks into the fat-sugar mixture. Stir in quark, pudding powder and semolina. Beat the egg whites until stiff. Carefully fold in beaten egg whites, cherries and chocolate crumbles. Spread the quark mixture on the crumble base. Add the rest of the chocolate crumbles. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 1 hour. Cover if necessary after half the time.
Carefully fold in beaten egg whites, cherries and chocolate crumbles. Spread the quark mixture on the crumble base. Add the rest of the chocolate crumbles. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 1 hour. Cover if necessary after half the time. Place the cake on a grid, remove from the edge of the springform pan and allow to cool in the pan