Beat the egg whites with a pinch of salt until stiff, pour in the sugar and keep beating until the snow is firm and shiny.
Beat the butter with the powdered sugar until frothy. Stir in the egg yolks one at a time.
Then add the nuts, poppy seeds and orange liqueur and fold in. Finally fold in the egg whites carefully and loosely.
Pour the dough into a greased springform pan sprinkled with breadcrumbs and bake in the preheated oven at 175 degrees top / bottom heat for 55 to 60 minutes.
Spread the jam on the cake while it is still warm. Let cool slightly, remove from the mold and sprinkle with powdered sugar.