Peel, wash and finely grate the carrots. Mix 125 g sugar, oil, salt and eggs with the whisk of the mixer. Mix flour, baking powder and cinnamon. Alternately stir the flour mixture and buttermilk into the egg mixture. Fold in carrots and grated coconut.
Spread a third of the dough in a greased and floured springform pan (24 cm Ø) until smooth. Bake in a preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for 15-20 minutes. Let it cool down a little, remove from the mould and let it cool down on a grid. Wipe out the mould, grease again and dust with flour. From the remaining dough bake 2 more cakes in this way.
Mix 100 g sugar, vanilla sugar and cream setting agent. Whip the sour cream and cream with the whisks of the mixer until stiff, letting the sugar mixture trickle in. Coarsely chop the walnuts.
Place a cake ring around a cake base. Spread the cake base with cream to a thickness of approx. 1⁄2 cm. Repeat the process with the 2nd cake base, then finish with the 3rd cake base. Remove the cake ring. Spread the cake all around with the remaining cream. Sprinkle nuts on the cake and chill the cake for at least 2 hours.
The cake also works with normal wheat flour.