Stir butter or margarine until foamy. Gradually stir in the sugar, vanilla sugar and salt. Mix the flour and cornstarch, stir in seven and 2/3 of it. Knead the dough with the rest of the flour and the ground hazelnuts.
Turn the dough through a meat grinder with a shortbread cookie attachment and place in wreaths or S-shapes on a baking sheet lined with baking paper.
Bake in a hot oven at 175 ° C - 200 ° C top / bottom heat for about 10 minutes (depending on the oven).
Dip the half-cooled pastry in the sugar mixed with cinnamon.