Vanilla Crescent Biscuits (Vanillekipferln)

Place the flour on a clean work surface and mix in the ground almonds and hazelnuts. Knead together the cubed butter, sugar, eggs and salt, then add this mixture to the flour and work into a smooth dough. Shape the dough into a log, cover, and chill in the refrigerator for 1 hour. Cut the dough into small pieces, roll each piece into a ball, then form small cylinders and bend the ends to shape the traditional crescents. Arrange the crescents on a baking sheet lined with parchment paper. Bake at 170–180 °C until lightly golden.
While still warm, roll the biscuits in a mixture of sugar and vanilla sugar.