Dissolve coffee in 2 cups of hot water with alcohol. Use a dish that your ladyfingers will fit in.
Whisk egg yolks with 4 tbs of sugar until smooth. Once combined add mascarpone cheese and mix together. You can switch to a spatula. It will be easier to mix.
Whip egg whites until stiff by adding 1tbs of sugar by the end. Combine with your yolk-mascarpone mixture by folding in with spatula carefully.
Dip one ladyfinger at the time in coffee just for a quick skinny-dip and lay tightly next to each other in a glass or ceramic pan (I use 20x21, 7cm deep). Cover with cream and do another layer. I usually do 2 layers.
Cover and chill in the fridge for at least 6/7 hours but I highly recommend overnight.
Dust with cocoa powder using a strainer and you are ready to serve.