Cream sugar, vanilla sugar and butter with the whisk of the hand mixer. Beat the eggs separately. Add flour, baking powder and hazelnuts and knead to a smooth dough. Put the dough in a cool place for about 2 hours. Roll out the dough on a floured work surface to a thickness of about 1 cm. Cut out with various cutters and place on 3-4 baking trays lined with baking paper. Mix egg yolks with milk.
Brush cookies with egg yolk milk. Bake one after the other in a preheated oven (electric: 175 °C/ convection oven: 150 °C/ gas: level 2) for 10-12 minutes. Then let them cool down on a cake rack. For the icing, stir icing sugar, egg white and lemon juice until smooth. Halve the icing and colour one half green with food colouring. Decorate cookies with icing, chocolate lentils, crumbles and sugar pearls
2 1/4 hours waiting time