Beat the cold mascarpone cheese until smooth and creamy.
In a heatproof bowl over simmering water, whisk the egg yolks with the sugar for about 2 minutes until pale and fluffy.
Remove from the heat and combine the egg mixture with mascarpone, vanilla, and salt until just incorporated.
In another bowl, whip the chilled heavy cream to medium-stiff peaks.
Fold the whipped cream gently into the mascarpone mixture in several additions until light and fluffy.
Pour the cooled coffee into a shallow bowl.
Quickly dip each ladyfinger into the coffee without soaking them too long.
Arrange one layer of dipped ladyfingers in an 8 × 9½-inch baking dish.
Spread half of the mascarpone filling evenly over the cookies.
Repeat with another layer of coffee-soaked ladyfingers.
Spread the remaining cream evenly over the top.
Cover and refrigerate the Classic Italian Tiramisu Recipe for at least 6 hours, preferably overnight.
Dust generously with cocoa powder before slicing and serving.