01 -
In a mixing bowl, blend cocoa powder with brewed espresso and vanilla extract. Optionally, incorporate dark rum. Stir until smooth and set aside for soaking the cookies.
02 -
Using a stand or hand mixer, whip the cold egg yolks with sugar on medium-high speed until the mixture is pale and thick, about 5 minutes. Add kosher salt.
03 -
Fold in chilled mascarpone cheese and whip until the mixture is completely smooth and creamy, being careful not to overmix.
04 -
Pour cold heavy cream into the mascarpone mixture and continue whipping until soft peaks form and the filling becomes light and airy.
05 -
Quickly dunk each ladyfinger cookie into the espresso-cocoa mixture for 1–2 seconds, ensuring they are lightly soaked but not soggy.
06 -
Arrange a single layer of soaked ladyfingers in a 7 x 11-inch oval baking dish. Evenly spread half of the mascarpone cream mixture over the cookies using a metal spoon and dust lightly with additional cocoa powder.
07 -
Add a second layer of soaked ladyfingers over the cream, then evenly spread the remaining mascarpone mixture. Finish by dusting the surface generously with more cocoa powder.
08 -
Cover tightly with plastic wrap and refrigerate a minimum of 2 hours, allowing the flavors to marry and the cream to firm slightly before serving.