For the dough, grate the marzipan in a bowl. Add 200 g icing sugar, almonds, cinnamon and 90 g egg white. Knead everything with the dough hooks of the hand mixer. Dust a work surface with icing sugar and roll out the mixture on it about 6 mm thick.
Cut out small (approx. 5 cm Ø) and larger (6-6.5 cm Ø) stars as desired (dip the moulds in icing sugar from time to time so that the dough does not stick) and spread them on 3 baking trays lined with baking paper.
Knead the dough again and again and roll it out until it is used up. Sift 400 g icing sugar for the icing. Beat 100 g egg white until stiff and finally stir in icing sugar and lemon juice bit by bit.
Thickly coat the stars with icing and bake the trays one after the other in the preheated oven, 2nd rail from below (electric oven: 150-160 °C/ convection oven: 125 °C/ gas: level 1) for about 15 minutes. Let the stars cool down on the baking tray.
Only then take it down and pack it into cans.