Warm the milk lukewarm. Mix some milk and 1 teaspoon of sugar and dissolve the yeast in it. Put the flour into a bowl, make a depression in the middle and add the yeast mixture. Dust with some flour and let it rise for about 5 minutes in a warm place. In the meantime dice the fat roughly.
As soon as the flour breaks open, add the rest of the lukewarm milk, the rest of the sugar, eggs, fat, lemon peel and salt and knead to a smooth dough. Cover the dough and let it rise in a warm place for about 30 minutes. Drain the cherries. Roll out the dough on a floured work surface to a rectangle (approx. 54 x 20 cm). Cut the dough rectangle crosswise into 3 pieces. Spread the poppy seed mixture over the 3 parts and smooth it down. Spread the cherries on top and roll them up individually on the long side. Cut the 3 parts lengthwise and braid them into a plait. Place on a baking tray covered with baking paper and leave to rise for about 30 minutes. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) on the 2nd rack from below for about 50 minutes.
Spread the poppy seed mixture over the 3 parts and smooth it down. Spread the cherries on top and roll them up individually on the long side. Cut the 3 parts lengthwise and braid them into a plait. Place on a baking tray covered with baking paper and leave to rise for about 30 minutes. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) on the 2nd rack from below for about 50 minutes. Stir lemon juice with icing sugar until smooth. Remove the cherry-poppy seed slice from the oven, spread with the sugar icing and allow to cool
1 hour waiting time