Wash the lemon with hot water, dab dry and rub the peel. Mix lemon zest, flour, 120 g icing sugar, vanillin sugar and salt. Add fat in flakes and egg yolk and knead everything with the dough hooks of the hand mixer to a smooth dough. Then quickly form into a ball with cold hands. Wrap the dough in foil and refrigerate for about 2 hours. Roll out the dough on a floured work surface and cut out hearts about 10 cm long using a cookie cutter.
Use a cookie cutter (approx. 7 cm) to cut out smaller hearts from half of the hearts. Line a baking tray with baking paper, place all hearts on top and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for approx. 10 minutes. Remove from the baking tray immediately and let cool on a cake rack. Dust small hearts and heart rings thickly with the remaining icing sugar. Heat up the redcurrant jelly in a pot, spread the large hearts with it and place the heart rings on top. Results in 12 filled and 12 small hearts
Preparation time approx. 40 minutes (without waiting time). Per small heart about 290 kJ/ 70 kcal. Per filled heart 1090 kJ/ 260 kcal