Prepare the espresso and let it cool completely. If using liqueur, stir in the Amaretto.
In a bowl, combine the mascarpone, powdered sugar, and vanilla extract. Mix until smooth and creamy.
In a separate bowl, whip the heavy cream until stiff peaks form. Gently fold the whipped cream into the mascarpone mixture until just combined.
Line a cake pan with parchment paper. Spread a layer of mascarpone cream on the bottom. Quickly dip the ladyfingers in the cooled espresso and arrange them over the cream.
Continue layering: mascarpone cream, then espresso-soaked ladyfingers, until all ingredients are used. The top layer should be mascarpone cream.
Smooth the top and dust generously with cocoa powder. Refrigerate the cake for at least 4 hours, or preferably overnight, to allow the flavors to meld.
Before serving, remove the sides of the cake pan. Dust with additional cocoa powder or garnish with chocolate shavings, if desired.
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