Using the whisk on a hand mixer, beat the butter, sugar, vanilla sugar, salt and egg in a bowl until the mixture becomes lighter in colour.
Stir the almonds and all the other ingredients into the mixture. Using a teaspoon, spoon the dough into small mounds on a baking tray lined with baking paper, ensuring they are well spaced out.
Approx. 12 mins. in the centre of an oven preheated to 200°C. Remove from the oven, allow to cool a little, then leave to cool completely on a rack.
Mix the icing sugar and lemon juice, drizzle on top of the biscuits.