Line baking tray with baking paper. Dice the apricots and, except for 1/4 for decoration, mix with 2 tablespoons of liqueur. Coarsely chop the pistachios. Coarsely grate marzipan, knead with 2 tbsp. liqueur. Shape into a roll (approx. 38 cm) with approx. 3 tbsp. icing sugar
Mix 500 g flour, baking powder, 1 pinch of salt, sugar and vanillin sugar. Add 125 g butter in flakes, quark, eggs and 1 tbsp. liqueur. Knead everything first with a hand mixer, then briefly with your hands until smooth. Knead in apricots and pistachios
Roll out the dough rectangularly (approx. 25 x 40 cm) on a little flour. Place the marzipan roll lengthwise on one half of the dough. Whip the 2nd half of the dough over it and press it down. If necessary, shape the stollen a little bit and lay them diagonally on the baking tray. Bake in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 15 minutes. Turn down to 175 °C (fan oven: 150 °C/gas: level 2) and continue baking for about 30 minutes.
Melt 125 g butter at low heat. Brush the hot stollen with 1/4 butter, go with 2 1/2. Dust with icing sugar. Repeat this procedure 3 more times. Let the stollen cool down. Decorate with pistachios and rest of apricots