In a bowl, take 1 ½ cup of brewed espresso and add 2-3 tbsp of coffee liqueur/marsala/brandy in it and mix well and let it cool
In a separate bowl, take 5 egg yolks and add ½ cup + 2 tbsp (125 gm) of sugar to it
Set that bowl over a pot with simmering water
Now whisk constantly, until the sugar is dissolved and the custard thickens
Note the temperature. The temperature of egg yolk should be 154-158o F (68-70o C)
Remove the bowl from heat and let it cool
Now add 14oz (425 gm) of mascarpone cheese and 1 tsp of vanilla extract into the batter and beat until smooth
In another bowl, add 1 ⅔ cups (400 ml) of cold heavy cream and whip to stiff peaks
First, fold one-third of the whipped heavy cream into the mascarpone mixture, then fold the rest of the whipped heavy cream
Dip each ladyfinger into the coffee mixture for 1-2 seconds
Set the ladyfingers to line-wise in the bottom of a 9x13 inch (22x33cm) dish
Spread half of the cream on top
Repeat the process with another layer of ladyfingers
Spread the remaining cream
Cover the surface of the dish with cling wrap and refrigerate for at least 6 hours
Now dust the top with cocoa powder and serve it.