Stir yeast and 1 tablespoon of sugar until the yeast is liquid. Heat the fat, add cold milk and remove from the heat. Put flour, egg, 1 tablespoon sugar, lemon rind and yeast in a mixing bowl.
Add the lukewarm milk-fat mixture and knead with the dough hooks of the hand mixer to a smooth yeast dough. Cover and leave to rise in a warm place for about 30 minutes. Roll out the dough on a floured work surface to a circle (approx. 32 cm Ø) and put it into a greased, flour-spread, sewing or pie mould.
Press the dough up at the edge of the mould and let it rise in the mould for another 20-30 minutes. In the meantime, wash and drain the plums, cut them into quarters and stone them. Notch the quarter again and cover the cake with the plums in flakes.
Sprinkle fruits with remaining sugar and bake in the preheated oven (electric cooker: 200 °C / gas: level 3) for about 30 minutes. Sprinkle the finished cake with sugar crystals and serve hot or cold with cream.
Results in about 12 pieces.