Finely grate the chocolate. Whisk eggs, sugar and 60 ml Amaretto over a hot water bath until a thick, frothy cream is formed. Stir in mascarpone by the spoonful. Whip cream until stiff, fold in. Mix espresso and 20 ml Amaretto. Soak the lady fingers in it.
Line an oven dish with half of the sponge cake. Pour half of the cream on it, smooth it down. Sprinkle with 50 g chocolate. Spread the rest of the lady fingers, cream and chocolate on top. Leave in the fridge for at least 6 hours, preferably overnight. Dust with cocoa powder and serve
waiting time approx. 6 hours