Cut the fat into small cubes. Knead flour, hazelnuts, fat cubes, icing sugar, egg, cocoa and cinnamon with the dough hooks of the hand mixer to a smooth dough. Let it rest in a cool place for about 5 minutes. Roll out the dough on a floured work surface to a thickness of about 3 mm and cut out hearts (about 5.5 cm Ø). Knead dough remains together, roll out again and cut out. Cut out a total of approx. 60 hearts. Place hearts on two baking trays lined with baking paper.
Then use a smaller heart cutter (approx. 3 cm Ø) to cut out the middle of half of the hearts. Bake in the preheated oven (electric: 200 °C/ gas: level 3) for 10-12 minutes in a row. Let them cool down for about 5 minutes and remove from the baking tray. Warm up the sour cherry jam, pass through a sieve and brush the whole hearts with it. Place hearts with a hole on top and fill up a little with chocolate coating. Dust with icing sugar if necessary. Results in about 30 pieces