01 -
Add the ladyfingers to a food processor and pulse into fine crumbs. Reserve 2 tablespoons of crumbs in case you need to firm the mixture later.
02 -
In a medium bowl, stir the cold mascarpone, powdered sugar, cooled espresso, vanilla, salt, and optional liqueur until smooth. Do not overmix once it loosens.
03 -
Add the ladyfinger crumbs and fold until a thick, scoopable dough forms. If it looks too soft, add the reserved crumbs 1 tablespoon at a time.
04 -
Cover the bowl and refrigerate for 20-30 minutes, until the mixture is firm enough to roll without sticking badly to your hands.
05 -
Scoop tablespoon-size portions and roll into balls. Arrange them on a parchment-lined tray.
06 -
Stir the cocoa powder with instant espresso powder if using. Roll each truffle in the coating, then chill until cold. Dust again lightly before serving if desired.