Cream fat and sugar and add eggs bit by bit. Mix the flour and speculoos spice and stir in by the spoonful. Stir salt of deer horn in milk and work into the dough with almonds and lemon peel using the dough hooks of the hand mixer.
Knead quickly with cool hands to a smooth dough and cover and leave in a cool place for about 30 minutes. Roll out the dough on a floured work surface to a thickness of approx. 3 mm. Cut out flower-shaped cookies (4 and 5 cm Ø).
Place the cookies on a baking tray lined with baking paper. Whisk the egg yolk and cream, spread the biscuits with it. Sprinkle with decorating sugar and bake in a preheated oven (electric: 200 °C/ gas: level 3) for 12-15 minutes.
Results in about 100 pieces.