Boil the chestnuts and peel the skins.
Mash the boiled chestnuts finely to make chestnut cream.
Mix espresso and sugar to make syrup.
Mix mascarpone cheese, heavy cream, and sugar well to make the cream.
Soak castella or ladyfingers with the syrup.
Alternate layers of chestnut cream and cheese cream on top of the soaked cake.
After stacking layers, finish by sprinkling chestnut powder or cocoa powder.