Place the ladyfingers side by side in a flat, rectangular baking dish (about 20x30cm). Mix cherry grits well with kirsch and distribute evenly on the ladyfingers. Beat the chilled whipped cream with the whipped cream and vanilla sugar until stiff. Mix the mascarpone with yoghurt and powdered sugar, fold in the cream and spread the cream evenly on the cherry jelly. Let everything soak in the refrigerator for 6-8 hours (preferably overnight). Sprinkle with grated chocolate before serving.