Preheat the oven to 200 ° C. Melt the butter. Beat the egg with sugar and vanilla sugar and add to the butter with the nuts. Mix everything well.
Spread out a roll of puff pastry, spread the mixture over it, spread the second roll over it. Cut into strips and screw in the individual strips slightly (then looks like a screw thread). Bake in the oven for about 20 minutes (depending on the oven) until golden brown. Dust with icing sugar after cooling.