Beat 2 egg whites with powdered sugar until stiff. Fold in the lemon zest, cinnamon, salt and almonds. Chill in the fridge for about 1 hour.
Roll out the dough to approximately 1/4-inch thick. Cut out up to 60 stars and place on the prepared baking trays. Be careful– the dough is sticky and really soft. Tip: Dip your cookie cutter in some extra powdered sugar to make cutting easier.
Preheat the oven to 140°C/280°F (convection oven 120°C/250°F).
For the icing, beat the egg white with a pinch of salt and the powdered sugar until stiff, and spread on each star with a pastry brush.
Bake each tray of cookies one at a time for about 20 minutes in the middle of your oven. Tip: You might insert one empty tray above the one with the stars so they stay light, because the icing is not supposed to become brown.