Clean, wash and stone the cherries and drain them well. (Pour cherries from the jar into a sieve and drain well.) Chop chocolate coarsely. Whip 200 g fat, 175 g sugar, salt and 1 packet vanilla sugar with the whisks of the hand mixer.
Stir in 4 eggs one after the other. Mix flour and baking powder and stir in alternately with the milk. Stir in chocolate. Put the dough into a greased fat pan of the oven (32x39 cm) and smooth it down.
Mix the remaining fat, vanillin sugar and sugar with the whisk of the hand mixer. Stir in the remaining eggs one after the other. Add quark, sour cream and pudding powder and mix well.
Pour the quark mixture onto the sponge mixture, smooth it down and spread the cherries evenly on top. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for 45-50 minutes. Remove from the oven and allow to cool on a rack.
Cut into pieces and serve decorated as desired with cream tuffs and chocolate rolls.