Knead the flour, 60 g sugar, 1 packet of vanilla sugar, egg and 125 g butter in flakes with the dough hooks of the hand mixer to a dough. Wrap in foil and chill for 30 minutes.
In the meantime, coarsely chop the almonds, 100 g hazelnuts and Amarettini. Grind 100 g hazelnuts finely. Warm up the jam and pass it through a sieve. Press the dough evenly flat on a greased and floured baking tray with your hands or roll it out.
Spread the dough with jam. Bring 250 g butter, 200 g sugar, 2 packets of vanillin sugar and 4 tablespoons of water to the boil. Let cool for about 10 minutes. Add nuts, amarettini and liqueur. Spread everything evenly on the dough.
Bake in the preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 30-35 minutes until golden brown. Remove nut corners from the oven and let them cool on a cake rack for about 15 minutes.
Cut the cake into about 24 triangles. Roughly chop the chocolate coating and melt it on a warm water bath. Dip each 2 corners of the nut corners into the chocolate coating and allow to dry.