Preheat your oven to 350°F (180°C). Grease and flour a cake pan, or line it with parchment paper.
In a large bowl, cream together the eggs and sugar until light and fluffy. Add the flour, baking powder, and ground walnuts. Mix until just combined.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the cake cool in the pan before slicing it into two layers.
For the cream, combine the chestnut puree, walnut cream, and heavy cream in a bowl. Mix until smooth and silky.
Spread the walnut cream filling between the two cake layers, then frost the top and sides of the cake.
Drizzle with chocolate sauce and garnish with ground walnuts. Tip: For an extra touch, add grated chocolate or whole walnuts.
Refrigerate the cake for at least 2 hours to allow the flavors to meld. Slice and serve chilled.
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