Chop the apricots roughly and sprinkle with liqueur. Cut marzipan into cubes. Coarsely chop the cashew nuts. Put flour, baking powder, 150 g fat in flakes, sugar, vanillin sugar, eggs and quark in a bowl and knead with the dough hooks of the hand mixer to a smooth dough.
Place the dough on a floured work surface and knead again with your hands. Knead in apricots, pistachios and cashew nuts. Roll out the dough on a floured work surface to a rectangle (32x38 cm).
Spread marzipan cubes evenly on top. Form the dough into a stollen. Place the Stollen on a baking tray lined with baking paper and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for 60-70 minutes.
Cover the stollen after half the baking time. Take the stollen out of the oven and let them cool down on a cake rack. Melt the rest of the fat, spread 1/4 on the still warm stollen and sieve 1/4 of the icing sugar on top.
Repeat the process several times until icing sugar and liquid fat are used up.