Roll out the dough between 2 layers of foil to a plate (30x20 cm). Spread with 2 tablespoons of jam. Knead marzipan and icing sugar. Roll out to a plate of the same size and place on the dough plate. Spread with the rest of the jam.
Form into a roll with the help of the foil. Brush it with egg yolk and roll it all around in sugar. Cut the roll into slices and distribute on a baking tray lined with baking paper. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 10-12 minutes