Boil the chestnuts and peel them.
Whip the heavy cream and sugar to make cream.
Mix mascarpone cheese with the whipped cream.
Combine espresso and syrup.
Soak ladyfingers in the coffee mixture.
Layer chestnuts, cream, and ladyfingers in a container.
Finish with a sprinkle of cocoa powder.
Let chill in the refrigerator for at least 2 hours.