Knead the nuts, butter, sugar, vanilla seeds, egg, salt, flour and cornstarch into a smooth dough. Wrap the dough in plastic and chill for about 30 minutes.
Form the dough into 4-5 mm (approximately 1/4 inch) thick rolls. Slice the dough. Place the cookies on a lined baking sheet. Bake for 10-12 minutes at 180°C (approximately 350°F). Remove from the oven, let cool and serve.