Wash the pumpkin thoroughly and remove the skin and seeds.
Steam the pumpkin in a steamer for 15 minutes, then mash it.
Whip the heavy cream with sugar until stiff peaks form.
Soften the cream cheese and mix it with the mashed pumpkin.
Fold the whipped cream into the pumpkin cream cheese mixture.
Soak castella or ladyfingers in espresso.
In a dish, layer the soaked cake and pumpkin cream alternately.
Top with the remaining pumpkin cream and sprinkle with cinnamon powder or cocoa powder to finish.