Roughly grate the marzipan. Heat milk and vanilla sugar. Add marzipan and dissolve in the hot milk while stirring. Bring to the boil, remove from the stove. Add semolina while stirring and bring to the boil once. Let it swell for about 5 minutes.
In the meantime, separate the egg. Beat the egg white with salt until stiff, sprinkle in sugar. Whisk the egg yolks, mix with 2 tablespoons of semolina porridge, stir into the semolina porridge. Fold in the beaten egg white. Serve the semolina with plums, sprinkle with cinnamon and sugar