Dice the plums. Boil up with port wine in a wide pot, simmer for about 1 minute and let it cool down
Mix flour and salt. Press a depression in the middle. Heat half milk and 2 tablespoons of sugar. Crumble the yeast and dissolve in it. Pour into the hollow and mix with some of the flour to make a pre-dough. Cover and leave to rise in a warm place for about 15 minutes
Melt 200 g butter. Add the rest of the milk. Let it cool down. Add almonds, 2 tablespoons sugar, vanillin sugar and lemon zest to the pre-dough. Knead everything smooth with the dough hooks of the hand mixer. Cover and leave to rise in a warm place for 1 1/4-1 1/2 hours
Knead marzipan and 100 g icing sugar. Roll out to a rectangle (approx. 25 x 30 cm) between cling film. Drain the plums and knead into the dough. Roll out on flour to a rectangle (approx. 25 x 30 cm). Place marzipan on top. Roll everything up from the long side and flatten it a little. Whip from the long side to 2/3.
Place the stollen on a baking tray lined with baking paper and leave to rise for another 45 minutes. Pre-bake in the hot oven on the 2nd rack from below (electric oven: 200 °C/circulating air:175 °C/gas: level 3) for approx. 10 minutes. Then continue baking at 175 °C (convection oven: 150 °C/gas: level 2) for 25-30 minutes
Melt 650 g butter and brush the hot stollen with 1/3 of the butter. Then dust with 1/3 of the remaining powdered sugar. Repeat the process twice more. Let the stollen cool down