A classic no-bake Italian tiramisu made with espresso-dipped ladyfingers, mascarpone cream, and a generous cocoa finish. Chill it well for clean slices and the best flavor.
Set a heatproof bowl over a saucepan of barely simmering water. Add the egg yolks and sugar, then whisk for 6 to 8 minutes, until thick, pale, and warm to the touch.
Remove the bowl from the heat and let it cool for 5 minutes, whisking occasionally.
In a separate bowl, whip the cold heavy cream to soft peaks.
Beat the mascarpone, vanilla, and salt into the yolk mixture until smooth. Fold in the whipped cream in two additions, keeping the mixture light.
Assemble and chill:
Stir the cooled espresso and coffee liqueur together in a shallow dish, if using the liqueur.
Quickly dip half of the ladyfingers, one at a time, into the espresso mixture. Arrange them in a single layer in a 9-by-13-inch dish.
Spread half of the mascarpone cream over the ladyfingers. Repeat with the remaining dipped ladyfingers and cream.
Cover and refrigerate for at least 6 hours, or overnight for the cleanest slices.
Dust generously with cocoa powder just before serving. Add grated dark chocolate if you like.
Notes
Dip the ladyfingers quickly. A full soak can make the dessert watery.
For a no-alcohol version, skip the liqueur and use all espresso or strong coffee.
Use pasteurized eggs if serving to anyone who needs to avoid raw or lightly cooked eggs.