Spread a springform pan (26 cm Ø; approx. 8 cm high) with a little oil. Wash and quarter the Hokkaido pumpkin. Scrape out the fibrous interior together with the seeds with a spoon or cut away with a knife. Coarsely grate the pumpkin flesh together with the skin
Separate eggs. Mix the egg yolks, sugar, vanillin sugar, 1/2 teaspoon salt, cinnamon and 200 ml oil with the whisk of the hand mixer. Add pumpkin flesh and stir in. Let rest for about 5 minutes so that the pumpkin draws some water
In the meantime, grind the walnuts very finely in a compact chopper. The nuts
Mix well with flour and baking powder. Add to the pumpkin and egg yolk mixture and stir in evenly
Beat the egg white until stiff and fold in. Fill dough into the form. In the preheated oven
(electric cooker: 175 °C/circulating air: 150 °C/gas: stage 2) Bake for approx. 1 hour (if necessary, remove from oven after approx. 40 minutes). Cool in the mould for approx. 10 minutes. Remove from the mould and allow to cool completely
Place the cake on a plate and dust with icing sugar. At the same time lift the cake a little bit to dust the edge as well. Served with: cream and chopped walnuts