Start by making the filling.
In a large mixing bowl, add the cream, and use a hand mixer to beat it until it holds stiff peaks.
Add the mascarpone and beat again.
Sift in the icing sugar, add the canned pumpkin and pumpkin pie spice, and beat again to incorporate everything.
Set the filling aside.
Line a square baking tray ( mine is 20 cm/ 8 inches in diameter) with clingfilm or non-stick paper.
In a bowl, mix the cold coffee with the pumpkin spice syrup.
Dip each ladyfinger in the syrup coffee, and arrange it into the prepared baking tray.
Repeat the process so the bottom of the tray is covered in one layer of ladyfingers.
Top the ladyfingers with half of the pumpkin filling, then dust it with half of the cocoa powder.
Repeat with one more layer of ladyfingers dipped in coffee, pumpkin filling and cocoa powder.
Refrigerate for at least 6 hours, ideally overnight.