Take the milk, lemon zest, and cinnamon to a pot. Bring to a boil over medium heat.
When it starts to boil, remove from heat, cover the pot and let it infuse, that is, take all the flavor of the lemon peel.
When it is cold, make it to the freezer for about an hour to crystallize, you can stir it with a fork.
Place the egg whites, the pinch of salt in a bowl and begin to beat by hand with a fork until foam comes out.
Then you must beat with the blender and add the sugar little by little until the mixture is about to snow, so much that when you turn the bowl, nothing falls from it.
Add the snow cone milk with the meringue and mix it with a spatula in an enveloping way until everything is well mixed and fluffy.
Serve and decorate with ground cinnamon.