Drain the plums and collect the juice. Wash the lemon hot, dry it and peel the peel spirally. Stir 3 tbsp. plum juice and starch until smooth. Boil up the rest of the juice, 2 tbsp. sugar, lemon peel and cinnamon stick.
Stir in the mixed starch and simmer for 3-4 minutes. Add the plums, bring to the boil briefly. Let it cool down.
Bring milk, 2 tablespoons sugar and vanilla sugar to the boil while stirring. Take the pot from the stove, sprinkle in the semolina while stirring. Put the pot back on the stove and simmer for 1-2 minutes, stirring continuously.
Remove from heat, cover and leave to swell for approx. 10 minutes.
In the meantime, separate the eggs. Beat the egg whites until stiff, adding 1 tablespoon of sugar and 1 pinch of salt. Mix the egg yolks and 2 tablespoons of hot semolina. Stir into the remaining semolina. Fold in the beaten egg white. Remove cinnamon stick and lemon peel from the plum compote.
Serve semolina porridge warm or cold with the compote.