Mix together espresso and pumpkin liqueur.
Dip the savoiardi, one at a time, into mixture. Flip over to ensure they are soaked through but not falling apart.
Place in the bottom of a deep 9-inch x 13-inch dish.
Top with half the pumpkin custard.
Spread with half the mascarpone cream.
Dip remaining savoiardi and place them on top of mascarpone.
Top with remaining custard.
Spoon remaining mascarpone into a piping bag fitted with desired tip.
Pipe over the entire top.
Sift cocoa over top to finish.
Refrigerate for 4-6 hours, or overnight before serving.