First, squeeze half an organic lemon and collect the juice.If you want to grind the almond kernels yourself, you can use a multi-grinder, a nut grinder or a coffee grinder.
Then line a baking tray with baking paper and preheat the oven to 140 ° C top/bottom heat (275° F, 120 ° C convection).
Beat the egg whites in a mixing bowl with a hand mixer until very stiff, gradually add the icing sugar, stir it in and add the lemon juice. Beat until the mixture is glossy and creamy. For the icing, take 4 tablespoons of the mixture and put it aside.
Now stir the ground almonds and the cinnamon into the egg white and sugar cream and knead everything into a dough. Cover the dough and refrigerate it overnight, or at least for 3 hours.
Roll out the dough to a thickness of 1 cm on a floured work surface and cut out stars with a star cutter. Place them on the prepared baking tray at a sufficient distance apart and brush each one with the egg white sugar cream.
Leave the cinnamon stars to dry/bake for 30 to 40 minutes.
They should not brown and should still be a little soft. Then take them out and let them cool.