Roughly grate the marzipan. Place in a bowl with the flour, sugar, egg, salt and butter in pieces. Knead first with the dough hooks of the hand mixer, then with your hands to a smooth dough. Cover and chill for about 1 hour. Roll out the dough on a floured work surface to a thickness of approx. 6 mm. Cut out circles (approx. 4 cm Ø). Place on two baking trays lined with baking paper.
Bake one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 10-12 minutes. Let them cool down. Chop the couverture, melt with nougat over a warm water bath. Dip about 1/4 of the thaler in the nougat mixture. Drain and put the und dipped side on baking paper. Press a pattern on each thaler with a fork and sprinkle with pistachios, let dry. Store in a cool place
2 hours waiting time