Crumble the yeast, mix with 1 teaspoon of sugar and milk. Leave in a warm place for about 10 minutes. Put soft fat, salt, flour, 1 egg, 3 tablespoons sugar and vanillin sugar in a bowl. Add the yeast mixture and knead with the dough hooks of the hand mixer to a smooth dough. Cover and leave to rise in a warm place for about 30 minutes.
In the meantime, finely chop the walnuts. Dice the apricots finely. Knead marzipan, nuts, apricots, rum and 2 eggs. Knead the dough again and divide into three. Roll out one third of the dough one after the other on a floured work surface to a rectangle (approx. 70 x 15 cm). Cut the marzipan mixture into thirds as well. Pour the marzipan mixture onto each rectangle in the middle and spread it out a little lengthwise, roll it up. Weave the three dough rolls into a plait. Place the plait in a greased tube bottom form (26 cm Ø). Whisk the egg yolk and brush the plait with it.
Pour the marzipan mixture onto each rectangle in the middle and spread it out a little lengthwise, roll it up. Weave the three dough rolls into a plait. Place the plait in a greased tube bottom form (26 cm Ø). Whisk the egg yolk and brush the plait with it. Sprinkle with sugar crystals. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-45 minutes. Let it cool down on a cake rack
waiting time approx. 3 hours