Chocolate Hazelnut Mousse Cake

Bahan-bahan (10 porsi)

• ¼ cup (about 34 nuts) hazelnuts, (skins rubbed off)
• 2 tablespoons granulated white sugar
• ½ cup all purpose flour
• ¼ cup unsalted butter, (at room temperature)
• 2 tablespoons Dutch process cocoa powder
• 1 pinch salt
• 1 teaspoon unflavored gelatin
• 3 tablespoons cold water
• ½ cup Nutella Hazelnut Spread
• ¼ teaspoon espresso powder
• ½ cup mascarpone cheese, (at room temperature)
• 1 teaspoon vanilla extract
• 1½ cups heavy whipping cream
• 2 tablespoons Dutch process cocoa powder
• 3 tablespoons granulated sugar
• ⅓ cup heavy whipping cream
• 4 ounces bittersweet chocolate, (chopped)
• ¼ cup toasted chopped hazelnuts, (for garnish)