Grate marzipan.
Mix flour, sugar, salt and crumble with butter (in small pieces) and 100 g marzipan.
Knead 2/3 of the mix with an egg to a dough.
Roll out the dough and place it in a springform (26 cm diameter). Press to the bottom and sides. Pick with a fork several times.
Bake in preheated oven at 180°C for about 10 minutes.
Pit fresh cherries or drain cherries from the jar.
Mix cherries with cornstarch and sugar.
Place cherries on baked shortcrust pastry.
Sprinkle the marzipan on cherries.
Crumble the rest of the crumble mix with wet hands to bigger pieces and spread on cake.
Bake in oven at 180°C for further 35 to 40 minutes.
Leave to cool. Dust with powdered sugar. (Optional)