Mix the sugar, vanilla sugar and salt and mix well with the melted butter. Stir in the eggs. Mix the flour, cornstarch, baking powder and cocoa and stir in.
Grease a 26 ring cake pan or springform pan (if you like the cake taller, use a smaller pan) and sprinkle with durum wheat semolina. Pour the dough into the mold and bake in the preheated oven at 180 ° C top / bottom heat for about 45 minutes.
Let cool a little, remove from the mold and dust lightly with powdered sugar.