Sift the icing sugar. Beat the egg whites and lemon juice with the whisk of the hand mixer until stiff. Continue beating, gradually adding icing sugar. Remove 1/3 of the beaten egg whites and fill into a freezer bag, close the bag.
Mix cinnamon, lemon peel and nuts and fold into the remaining beaten egg white. Roll out the dough on a work surface dusted with icing sugar to a thickness of about 1 cm. Cut out stars about 5 cm in size, dipping the cutter in flour in between.
Knead the remaining dough again and again. Put the stars on 2 baking sheets covered with baking paper. Cut off a corner of the freezer bag, sprinkle beaten egg white on the stars and smooth it down with a knife, blade moistened.
Bake the trays one after the other in a preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: stage 1) for approx. 15 minutes.