Put the milk, the cinnamon stick, the lemon peel and the normal sugar in a saucepan. Wait until it starts to boil. When it starts to boil turn off the heat and let it cool.
Place the cooled milk mixture in a suitable container and put it in the freezer. It won't freeze completely, but it will cool down to near freezing. This means approximately 2 hours of time.
Place the egg whites in a deep bowl. Add powdered sugar to it and obtain a solid meringue by beating until it reaches a consistency that will not fall to the ground when you turn the bowl upside down.
Remove the milk mixture that you put in the freezer, which is close to the freezing level but is still liquid. Pour the meringue you have prepared over it and mix it with a wooden spoon, using slow movements from outside to inside, without deflating the meringue.
Portion the mixture into glasses and decorate with a pinch of ground cinnamon. Bon Appetit!