Roll the shortbread pastry out to a thickness of 2 mm. Prick with a fork. Cut out to the size of the frame. Bake in a fan-assisted oven at 160 °C for 15 mn.
Whisk the eggs, icing sugar, flour and ground ingredients. Add the hot butter then the whisked egg whites stiffened with sugar. Spread onto a baking tray and bake in a fan-assisted oven at 220 °C for 8 mn. Leave to cool.
Cook the sugar to dry. Deglaze with water and add the coffee extract.
Cook the sugar to dry. Deglaze with the heated cream and glucose. Add the cocoa butter, milk couverture chocolate, coffee extract and lastly the butter.
Soften the pastry cream then add the softened gelatine. Combine with the mascarpone and whipped cream.
Whisk all the ingredients together using a mixer.
Heat the sugar and water to 117 °C. Add the toasted hazelnuts and stir until evenly coated and the sugar has re-crystallized. Leave to cool. Melt the milk couverture chocolate then add the melted cocoa butter and the sugared hazelnuts.