For the shortcrust pastry, put all the ingredients in a bowl and knead with your hands to form a smooth dough. Wrap in foil and place in the refrigerator for at least half an hour.
Drain the cherries well, if necessary pat dry with a little kitchen paper.
Whisk the quark with the custard powder, lemon juice and vanilla sugar. Mix in the eggs one at a time.
Pour approx. 1/3 of the cream into a separate bowl and mix well with Nutella and 1 tablespoon of sugar.
Whisk the rest of the cream with 85 g sugar and the amaretto, then fold in the cherries.
Take the dough out of the refrigerator, roll it out and line a greased springform pan with it. Form a border 3-4 cm high. Prick the base several times with a fork, then distribute the light cherry mixture evenly on top. Spread the Nutella mixture evenly on top and marble the creams a little with a fork.
Bake at 180 ° C for 50-60 minutes. Let cool in the springform pan, only then carefully loosen the edge.
My tip: since rolled-out shortcrust pastry tears easily, you can simply crumble the dough with your hands in a bowl so that it looks like crumble. Put these crumbs in the springform pan and simply press on with your hand. Leave a few sprinkles to shape the edge.