Stir the butter until foamy, stir 2 teaspoons of powdered sugar, ground almonds, egg yolks and salt into the butter, gradually stir in the flour, form walnut-sized balls, bake at 150 ° C for 45 minutes - they should be very light !!! - on a wire rack As soon as they are almost cold, roll them in 250 g of powdered sugar, put them back on the wire rack and sift the remaining powdered sugar over them.