Drain the cherries in a sieve. Mix the quark, sugar, vanilla sugar, oil and milk with a whisk in a mixing bowl until smooth. Mix flour and baking powder and knead into the quark mixture gradually with the dough hooks of the hand mixer. Work into a smooth dough with your hands. Roll out the dough on a floured clean tea towel to a rectangle (approx. 50 cm x 60 cm)
Chop the chocolate into small pieces. Stir jam with mint liqueur until smooth and spread on the pastry sheet. Spread cherries on the jam and sprinkle with chocolate. Whip the long side of the pastry sheet and roll it up using a tea towel
Cut the dough roll into approx. 20 slices, place them side by side on a well greased fat pan (27 x 40 cm) of the oven and bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 40 minutes. Remove the cake from the oven and let it cool down on a cake rack. Serve with whipped cream