1) Knead the flour with diced cold butter, lo powdered sugar, a pinch of salt and the you working the ingredients quickly until a homogeneous mixture is obtained.
2) Divide it into blocks and form cylinders of 3 cm in diameter. Wrap them with cling film and put them in the freezer for 1 hour.
3) Remove the film and cut the cylinders into slices about 1/2 cm thick. Arrange them on a baking sheet lined with baking paper, brush them with the albumen, sprinkle them with black sesame and bake them in a preheated oven at 180 degrees for 15 minutes. Remove the cookies from the oven and serve cold.
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