Bring milk, sugar and lemon peel to the boil. Stir in semolina and let it swell at low heat for about 5 minutes
Separate the egg. Stir the egg yolk into the hot semolina. Beat egg white and 1 pinch of salt until stiff. Fold into the semolina. Pour the mixture into 4 cold rinsed moulds (150 ml each). Chill for at least 4 hours.
Select the raspberries, rinse and, except for a few, puree them. Season to taste with vanilla sugar and arrange on 4 plates. Drizzle cream over the raspberries as a blob. Remove the flummery from the pan and turn it over onto the plates. Decorate with lemon balm and raspberries