Mix flour, cornstarch, sugar, vanillin sugar and salt in a bowl. Add egg and butter in pieces and knead everything with the dough hooks of the hand mixer. Finally knead with your hands to a smooth dough. Wrap in cling film and chill for about 1 hour. In the meantime knead marzipan and icing sugar.
Dust a work surface with icing sugar, roll out the marzipan thinly on top. Cut out about 62 triangles (5.5-6 cm side length). Set aside. Roll out the dough on a floured work surface to a thickness of about 3 mm and cut out about 62 triangles of the same size. Divide the cookies between 2 baking trays lined with baking paper. Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 8-10 minutes. Let them cool down. In the meantime, heat the jam and port wine in a saucepan and pass through a sieve. Spread the cookies with jam and place the marzipan triangles on top. Coarsely chop the chocolate coating and melt it on a hot water bath.
Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 8-10 minutes. Let them cool down. In the meantime, heat the jam and port wine in a saucepan and pass through a sieve. Spread the cookies with jam and place the marzipan triangles on top. Coarsely chop the chocolate coating and melt it on a hot water bath. Coat the triangles with couverture and sprinkle one corner each with pistachios. Leave to dry
waiting time approx. 1 1/4 hours