Melt 75 g butter at low heat. Mix flour, 75 g sugar and 1 pinch of salt. Warm the milk lukewarm. Crumble yeast into it and dissolve it while stirring. Add the yeast milk, melted butter and egg to the flour mixture and knead everything into a smooth dough with the dough hooks of the mixer.
Roughly chop the nuts. Melt 50 g butter. Mix 75 g sugar and cinnamon. Knead the yeast dough again and roll out to a rectangle (approx. 36 x 42 cm) on some flour. Place on a baking tray lined with baking paper.
Spread the pastry plate with some of the butter. Sprinkle with approx. 3⁄4 cinnamon sugar. Spread about 500 g plum puree on top. Sprinkle with approx. 3⁄4 of the nuts. Roll both long sides up to the middle.
Spread the rest of the plum puree in the middle, sprinkle the rest of the nuts on top. Spread the dough with the rest of butter and sprinkle the rest of cinnamon sugar on top.
Bake in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: see manufacturer) for 25-30 minutes. Let them cool down. Stir icing sugar and rum until smooth. Spread the icing with a spoon on the yeast strip and allow to dry.