First make the coffee, add sugar and brand, and let it cool.
Now carefully separate the egg whites from the yolks, remembering that the whites must not contain any traces of egg yolks.
Then whip the egg yolks with a hand mixer, slowly drizzling in the sugar. Once the mixture is clear and fluffy, you can add the mascarpone cheese little by little to prevent grains from forming. When all the cheese is incorporated, you will have a thick and compact cream; set it aside.
Now, in a new bowl, beat the egg whites until they form stiff peaks. Add the remaining mascarpone and egg custard cream stirring gently from the bottom to the top.
Dip the ladyfingers in the cooled coffee for a few seconds and make a layer in a 13x9 inch baking dish.
Using a spatula, spread the mascarpone-egg cream evenly and continue with another layer of ladyfingers, followed by more cream.
Smooth the top, sprinkle with unsweetened cocoa powder and refrigerate for at least 3 hours to set. Your tiramisù is ready to be enjoyed!