Butter and flour an 8" springform pan (with parchment paper lining the bottom.
Preheat the oven to 350β (176β).
Grind hazelnuts with sugar until fine. Place in bowl.
Add cocoa to the ground hazelnuts and sugar.
Beat egg whites until they come to stiff peaks.
Gently fold the dry ingredients into the beaten egg whites. Be careful not to over mix, but make sure they are thoroughly combined.
Pour mixture into prepared pan and bake for about 30 minutes, until a tester comes out clean.
Allow to cool in pan for about 15 minutes, then run a thin bladed knife around the edge of the pan and remove from the tin. Remove the parchment paper and place on cooling rack to cool completely.
Serve when cold, plain, with a Bicerin. Otherwise, serve with a warm chocolate sauce and freshly whipped, unsweetened cream.
Notes
PLEASE USE A SCALE FOR BEST RESULTS. Weighing the ingredients is important.
TIP: Using IGP hazelnuts from Piedmont, Italy, will yield the best results/flavor, however they are quite expensive and hard to find in the US. Try to use the tastiest hazelnuts you can find, and the cake is still truly delicious.
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