For the base, mix fat, sugar and vanilla sugar until creamy. Add fine lemon zest. Stir in the eggs bit by bit. Mix flour and baking powder and knead into the fat egg mass.
Spread the dough with a dough card on a greased baking tray. Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 15 minutes. Let it cool down. For the topping, melt sugar in a pan and caramelise until golden brown.
Stir in the fat. Add eight tablespoons of water and mix to a creamy mixture. Fold in nuts and spread evenly on the base. Allow to set and cut into triangles. Chop the chocolate coating and melt in a hot water bath.
Coat one corner of each pastry with chocolate coating and let it dry. Results in 24 pieces.