Wash, clean and cut the rhubarb into pieces. Bring milk and 1 pinch of salt to the boil. Stir in vanillin sugar, 50 g sugar and semolina, bring to the boil while stirring and let it swell for about 5 minutes.
Separate eggs. Beat egg whites until stiff. Whisk the yolks and stir into the semolina porridge. Fold in the beaten egg whites. Put half of the semolina into the greased form. Spread rhubarb on top and sprinkle with 4 tbsp. sugar.
Add the remaining semolina porridge to the rhubarb. Sprinkle with cinnamon sugar. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 30-40 minutes.