Melt the dark chocolate in a heatproof bowl set over a pan of simmering water (double boiler). Let it cool slightly.
Whip the heavy cream until stiff peaks form. Gradually add the powdered sugar and vanilla sugar while whipping.
In a separate bowl, combine the chestnut puree and butter until smooth.
Gently fold the whipped cream into the chestnut mixture. Then, add the melted chocolate and mix thoroughly.
Spoon the mixture into glasses or bowls, smoothing the tops.
Refrigerate the dessert for at least 2 hours to allow it to set and the flavors to meld.
Before serving, garnish with chocolate shavings and serve immediately.
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