01 -
Whisk egg yolks, sugar, and salt in a heat-proof bowl over simmering water until thick and pale (about 10-13 minutes).
02 -
Remove from heat and let cool for 5-10 minutes. Whisk in cold mascarpone and vanilla.
03 -
Beat cold heavy cream to medium-stiff peaks. Fold into the mascarpone mixture.
04 -
Combine cold espresso and Kahlua in a shallow dish. Dip ladyfingers briefly into the mixture.
05 -
Layer half the dipped ladyfingers in a 9x13 inch pan. Spread half the mascarpone mixture on top.
06 -
Repeat with another layer of ladyfingers and mascarpone. Dust with cocoa powder.
07 -
Chill for at least 8 hours before serving.