Put flour, salt, sugar, lemon zest and vanilla sugar into a mixing bowl and mix. Add butter and egg. Warm milk lukewarm, crumble yeast and dissolve in it. Pour into the mixing bowl. Knead everything with the dough hooks of the hand mixer to a smooth dough. Cover and leave to rise in a warm place for about 45 minutes.
In the meantime dice 125 g marzipan. Coarsely chop the walnuts. Knead marzipan, walnuts, cashews and hazelnuts with floured hands into the dough. Form into a roll. Place in a well greased, flour-spread ring cake tin (2.5 litres capacity). Let it rise again in a warm place for about 40 minutes. In the meantime knead 75 g marzipan and 40 g icing sugar. Sieve 10 g icing sugar thinly onto a work surface. Roll out the marzipan about 2 mm thick and cut out stars of different sizes. Place on a board and set aside. Bake the cake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-45 minutes on the bottom shelf.
In the meantime knead 75 g marzipan and 40 g icing sugar. Sieve 10 g icing sugar thinly onto a work surface. Roll out the marzipan about 2 mm thick and cut out stars of different sizes. Place on a board and set aside. Bake the cake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-45 minutes on the bottom shelf. Cover the cake after about 20 minutes of baking time. Take the cake out of the oven, let it rest in the form for approx. 15 minutes, turn it over on a grid and let it cool down. Bring water to the boil in a small saucepan. Remove from the stove and put the cake glaze in. After about 10 minutes, remove the bag (carefully, as it is hot) from the water, cut off the corner with scissors, spread the icing evenly over the cake. Let it dry, dust with cocoa and decorate with marzipan stars
Cover the cake after about 20 minutes of baking time. Take the cake out of the oven, let it rest in the form for approx. 15 minutes, turn it over on a grid and let it cool down. Bring water to the boil in a small saucepan. Remove from the stove and put the cake glaze in. After about 10 minutes, remove the bag (carefully, as it is hot) from the water, cut off the corner with scissors, spread the icing evenly over the cake. Let it dry, dust with cocoa and decorate with marzipan stars
Waiting time approx. 5 hours