Knead flour, salt, fat in flakes of egg yolk and sour cream to a smooth dough. Flatten and cover and leave to rest overnight in the refrigerator. The next day, cut the dough into quarters, knead the pieces of dough briefly and roll out to a thickness of approx. 2 mm on a floured work surface.
Cut out stars about 5 cm in size and place them on the baking tray lined with baking paper. For the macaroon mixture, beat the egg whites until very stiff, gradually pour in the sugar. Mix hazelnuts, cocoa and spices and fold in.
Pour the macaroon mixture into a piping bag with perforated spout and spray one macaroon tuff each onto the stars. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for approx. 18 minutes.