Carefully heat the butter in a saucepan. Stir in sugar and 70 g flour. Take off the fire. Stir in egg yolks and finally mix in the remaining 70 g flour. Let cool in the refrigerator for about 1 hour.
Shape into a roll, cut off small slices and shape them into finger-thick rolls (aligned with the smallest finger). Place these rolls on a baking sheet lined with baking paper.
Bake in a preheated oven at 180 ° C for about 10 minutes.