Mix the butter, sugar and vanilla sugar until frothy. Add eggs one at a time. Mix flour, baking powder and almonds,
stir in.
Grease a springform pan (24 cm diameter). dough
fill in. Place the plums on the dough like scales with the cut surface facing up. Bake in the preheated oven (lower rack) at 200 degrees (E) or level 3 (G) for about 40 minutes. Take out of the oven and sprinkle with sugar.