Prepare the vanilla pudding with the milk and some of the sugar and refrigerate. Whip the quark and the remaining sugar until creamy and fold in the pudding. Beat the egg whites until stiff and fold into the pudding mixture. Drizzle the coffee on the ladyfingers and layer them alternately with the cream in a mold, the last layer should consist of cream. Then sprinkle the tiramisu thickly with sifted cocoa powder and put in the refrigerator for 2-3 hours.