Melt the dark chocolate in a double boiler or in the microwave on low power. Stir until smooth and let it cool to room temperature.
In a bowl, whip the cold heavy cream until stiff peaks form. This ensures a light and airy mousse texture. Tip: Use chilled equipment for faster results.
In another bowl, beat the egg whites with a pinch of salt until stiff peaks form. Gradually add the powdered sugar while continuing to beat.
Combine the cooled chocolate with the lemon juice and lemon zest. Gently fold in the whipped cream, then fold in the beaten egg whites. Mix slowly to maintain the airy consistency.
Divide the mixture into glasses or bowls, and refrigerate for at least 2 hours to set.
Garnish with fresh lemon zest or grated chocolate before serving. Tip: Let the dessert sit at room temperature for 5 minutes before serving to enhance the flavors.
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