Separate the egg. Mix the egg yolk with a little milk.
Put the milk with salt, orange and lemon cest to boil, add half of sugar and semolina. Boil, constantly stirring until mixture thickens.
Mix in the egg yolk-milk-mixture.
Beat egg white with remaining sugar until stiff and fold with the orange liqueur and semolina mixture.
Fill in moulds and cool well for at least 2 hours.
Serve semolina flummery with a fruit sauce. Enjoy!