Preheat your oven to 350°F (180°C). Line a cake tin with parchment paper or grease and flour it.
In a large bowl, combine the flour, baking powder, and chestnut puree.
In another bowl, cream the butter and sugar together until light and fluffy. Add the eggs one at a time, mixing until smooth.
Mix the strong black coffee with the egg mixture, then add the flour and chestnut mixture. Mix until the batter is smooth.
Pour the batter into the prepared cake tin and bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean. Let it cool completely.
Whip the heavy cream until stiff peaks form. Fold in a little chestnut puree for extra flavor.
Spread the whipped cream frosting over the top and sides of the cooled cake. Sprinkle with cocoa powder and decorate with chocolate shavings.
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