Beat the lard, fat, sugar and vanillin sugar until foamy. Mix flour and ammonium bicarbonate of hartshorn and knead. Knead half of the dough with cocoa. Cover both halves of the dough and chill for at least 4 hours.
Form approx. 45 walnut-sized balls from each dough. Place on baking trays lined with baking paper. Press in the balls with your finger, turn them over and then put them back on the baking tray
Bake in the preheated oven (electric cooker: 200 °C / convection oven: 175 °C / gas: level 3) for 10-15 minutes per tray. Let the lard nuts cool down