Warm milk with a little sugar until lukewarm. Dissolve yeast in it. Make a pit in the flour and add the milk-yeast mixture. Cover with some flour. Leave in a warm place for about 5 minutes.
Then knead with the remaining sugar, eggs, fat, lemon and orange peel to a smooth dough. Cover and leave to rise in a warm place for about 30 minutes. In the meantime, mix chocolate, pistachios, raisins and rum together. Roll out the dough on a floured work surface to a thickness of approx. 5 mm and divide crosswise into 3 pieces. Spread the pistachio mixture on top and moisten the edges with water. Roll up each piece individually. Then weave the 3 rolls into a plait. Stir egg yolk with 1 tablespoon of water until smooth and brush the plait with it. Leave to rise again for another 15 minutes. Bake in the preheated oven (electric cooker: 175 °C/ gas: level 2) for 40-45 minutes.
Roll up each piece individually. Then weave the 3 rolls into a plait. Stir egg yolk with 1 tablespoon of water until smooth and brush the plait with it. Leave to rise again for another 15 minutes. Bake in the preheated oven (electric cooker: 175 °C/ gas: level 2) for 40-45 minutes. Take out and let cool down. Results in approx. 12 pieces