Put the flour on the work surface and make a well in the middle. Spread the egg, salt, cardamom and rum and softened butter around it in flakes. Sprinkle with sugar and grated walnuts.
Quickly knead a smooth dough from the outside in and knead it
Place in the refrigerator for ½ hour.
Then roll out on a floured work surface, 5 mm thick.
Cut out cookies with a diameter of 30 mm and place on a tray. Bake in a preheated oven at 220 ° C for approx. 10 minutes and then let cool down.
Brush half of the cookies with orange jam and put a second cookie on top. Mix the powdered sugar and rum.
Brush the cookies with it and press half a walnut into the glaze, which is not yet firm, and let it cool.