Prepare the ingredients: brew the espresso, separate the egg yolks and whites, and let the gelatin bloom in cold water.
In a bowl, whisk the egg yolks and sugar until pale and fluffy. Add the mascarpone cheese and mix until smooth.
Gently heat the bloomed gelatin until completely dissolved, then stir it into the mascarpone cream.
Whip the heavy cream to stiff peaks. Gently fold the whipped cream into the mascarpone mixture. This will be the mousse base.
Whip the egg whites to stiff peaks. Gently fold the whipped egg whites into the mousse base, ensuring it remains light and airy.
Line the bottom of a cake pan with ladyfingers, then drizzle with espresso. Spread a layer of mousse over the ladyfingers, followed by another layer of ladyfingers soaked in espresso.
Smooth the top of the cake and dust generously with cocoa powder. Refrigerate for at least 4 hours to set.
Before serving, garnish with fresh whipped cream or chocolate shavings, if desired.
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