Wash, drain and clean the gooseberries. Caramelise 100 g sugar in a pot until golden. Add 250 ml water (caution: hot steam!!!) and simmer until the caramel has dissolved.
Add gooseberries and simmer covered for about 4 minutes. Mix starch with a little water until smooth. Remove from heat, stir in the starch and simmer for 1 minute, stirring continuously. Bring milk with salt and 3 tablespoons of sugar to the boil.
Stir in the semolina and allow to trickle in. Simmer at low heat while stirring for 1-2 minutes, remove from heat. Halve 2 slices of marble cake. Separate the egg. Beat egg white until stiff. Stir the egg yolk into the semolina.
Fold in the egg white. Arrange semolina porridge with compote and 1 1/2 slices of cake each. Decorate with mint.