For the semolina strudel, bring milk, water, butter and salt to the boil, briefly boil the finely chopped leek and pour in the semolina.
Boil down for a few minutes, remove from heat and let cool. Stir in the yolks, beat the snow and mix in with the herbs.
Make a strudel dough from the ingredients, wrap in plastic wrap and let rest for half an hour. Roll out thinly, coat with the semolina mixture, roll up and place on a greased or baking tray lined with baking paper.
Brush with beaten egg and bake at 200 °C hot air for 25-30 minutes. After cooling, cut the semolina strudel into any pieces.