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Separate your eggs and set aside. Melt your butter in the microwave oven (make sure to use a microwave-safe cup).
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Place your chocolate pieces and a tablespoon of water in a microwave-safe bowl and melt for 2 minutes, mix chocolate and melt again for 1 minute. Mix so that it makes a nice paste. Mix in butter and set aside.
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Using an electric mixer, whip the egg whites with a pinch of salt until they are really stiff. Beat your egg yolks, adding in sugar and your chocolate mixture. Mix well.
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Gently pour your chocolate batter into the stiff whites. Once the egg whites are completely incorporated, pour into a serving bowl and cover with aluminum foil. Leave in the refrigerator for at least 3 hours.