Melt chocolate: Place chopped dark chocolate in a heatproof bowl and melt it over a double boiler. Let it cool slightly.
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Whip egg whites: Beat egg whites until foamy. Gradually add sugar and continue whisking until stiff peaks form.
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Whip cream: In another bowl, whisk chilled heavy cream until soft peaks form. Add vanilla extract if desired.
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Add yolks to chocolate: Stir egg yolks into the slightly cooled melted chocolate until smooth and glossy.
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Fold everything together: Gently fold the whipped cream into the chocolate mixture, then fold in the beaten egg whites.
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Chill and serve: Spoon into serving glasses, refrigerate for at least 2 hours, and serve chilled—plain or topped with whipped cream, berries, or shavings.