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Preheat oven to 160c degrees, and place on the oven floor a flat pan with boiling water to create a steamy baking environment.
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Melt chocolate and butter in a bowl in the microwave or over double-boiler.
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Add egg yolk into the chocolate mixture one by one, while whisking between additions. Add cocoa, vanilla and brandy and stir until completely blended.
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In a mixer bowl whip the egg whites and salt at high speed and gradually add in the sugar. Whip until stable peaks form.
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Fold the egg whites into the chocolate mixture until smooth.
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Transfer the mixture into a greased pan and bake for 30-35 minutes, or until the cake is cracked slightly at the top, set at the edges but still slightly soft in the center.
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Remove the cake from the oven and let it cool covered in order to remain soft and tender when completely cool.
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Sprinkle some powdered sugar and serve.