Roughly grate the marzipan. Mix the egg yolk, lemon zest, cinnamon and salt with a hand mixer until smooth. Pour into a piping bag with a large star-shaped spout
Spray approx. 20 rings (approx. 5 cm Ø) onto baking trays lined with baking paper. Bake in the preheated oven (electric cooker: 200 °C/recirculating air: 175 °C/gas: level 3) for approx. 4 minutes, then turn the oven down (electric cooker: 150 °C/recirculating air: 125 °C/gas: level 1). Continue baking for 5-6 minutes
Bring 40 g icing sugar and 4 tablespoons (40 ml) water to the boil, simmer for about 2 minutes. Spread hot macaroons with it, cool down. Dust with icing sugar