Mix egg yolks, lemon zest sugar and flour together in a bowl, there should be no lumps!
Add milk into a pan and slowly warm with the cinnamon stick. Slowly whisk this mixture into your warming milk, ensure there are no lumps.
On a very low heat, cook the mixture stirring constantly for 10 minutes until dense without any floppiness.
Take an oiled marble or wooden chopping board and dollop the dough like milk onto the board. Smooth into the shape of a rectangle that is about 2 cm deep & leave to cool for at least 5 hours.
Cut the cool dough into diamonds. Take each diamond, lightly dust each first into flour, then dip into a beaten egg and finally a quick and light dip into your superfine breadcrumbs.
Heat some peanut oil and fry each rectangle individually, when golden on both sides they are done.
Dust with a little icing sugar on top and serve warm or leave to cool for a summer treat.