Beat the butter and 4 tablespoons of sugar until creamy with the whisk of the hand mixer. Sift the flour over the mixture, add salt and knead with the dough hooks of the hand mixer. Roll out the dough on a lightly floured work surface to a thickness of about 1 cm. Cut dough into "fingers" or cake pieces or cut out circles. Place shortbreads on a board and chill for about 30 minutes.
Then prick the pieces several times in the middle with a fork or wooden skewer and sprinkle with 1 tablespoon of sugar. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower shelf for 12-18 minutes. Let it cool down on a cake rack. Dust with cocoa powder if necessary
30 minutes waiting time