For the plum dumplings with vanilla sauce, beat butter and powdered sugar until creamy, fold in egg and additional egg yolk and gradually add vanilla bean, semolina, flour and lemon peel. Then fold in the squeezed curd cheese.
Remove the seeds from the plums. Soak the sugar cubes in plum brandy or slibovitz and place in the plums (one piece per fruit). Enclose with dough as thick as a finger and steep in lightly salted boiling water for 6-9 minutes.
For the crumbs, melt the butter in a frying pan, add the sugar and crumbs, let them color slightly. Remove the crumbs from the frying pan and roll the plum dumplings in them.
Serve the plum dumplings with the vanilla sauce.