Grease a square springform pan (approx. 24 x 24 cm) and dust with flour. Cut butter into pieces. Knead flour, sugar, vanilla sugar, 1 pinch of salt, cocoa powder, egg and butter first with the dough hooks of the hand mixer, then briefly with your hands to a smooth dough.
Pour the dough into the springform pan and press to a flat base. Prick several times with a fork. Chill for about 30 minutes. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) Bake for 20-25 minutes. Remove from the oven and allow to cool on a cake rack.
Spread the caramel cream on the floor. Roast the hazelnuts in a pan without fat, spread on the caramel cream. Put it in a cold place. Break chocolate into pieces, melt with cream and coconut fat in a pan over low heat while stirring.
Allow the glaze to cool for 10-15 minutes and pour over the nuts, smoothing them down. Chill for about 1 hour. Remove Shortbread from the tin and cut into approx. 27 pieces.