Grease 4 ovenproof moulds or cups (each containing approx. 1/8 l) and sprinkle with sugar. Roughly chop the chocolate.
Bring milk, 2 tablespoons sugar, vanillin sugar and 1/2 teaspoon cinnamon to the boil. Sprinkle in semolina and simmer at low heat stirring for 2-3 minutes. Remove from heat.
Separate eggs. Stir the egg yolks one by one into the hot semolina porridge. Beat the egg whites and 1 pinch of salt until stiff with the whisk of the hand mixer. Also fold into the semolina.
Spread half of the semolina mixture into the moulds. Sprinkle 1/4 of the chocolate on each. Cover with the rest of the semolina mixture. Bake in the preheated oven (electric oven: 175 °C/circulating air: 150 °C/gas: level 2) for 20-30 minutes.
Serve immediately.