For the compote clean, wash and cut rhubarb into pieces. Boil up with lemon juice and 1⁄8 l water. Cover and simmer for about 5 minutes. Stir starch and 2 tbsp. cold water until smooth. Stir into the rhubarb and stir until at least a little bit thicker.
Simmer for a minute. Sweeten with 80 g sugar and pour into a flat casserole dish.
For the dumplings, boil up milk, 50 g sugar, vanilla sugar and 1 pinch of salt. Sprinkle in semolina while stirring, bring to the boil once and let it swell for about 2 minutes at low heat while stirring. Remove from the heat, cover and leave to swell for another 3-4 minutes.
Separate 1 egg. Gradually stir 3 tbsp. semolina into the egg yolk, then stir everything into the remaining semolina. Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Beat the egg white and 1 pinch of salt until stiff and fold into the semolina.
Cut off the semolina with two tablespoons of dumplings and place on the rhubarb.
Mix the sour cream and 1 egg, pour the icing over the semolina dumplings. Sprinkle almonds over it. Bake in a hot oven for 15-20 minutes.