INGREDIENTS
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6 ounces bittersweet or semisweet chocolate, chopped (see notes above)
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6 ounces unsalted butter, cut into small pieces
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1/4 cup dark-brewed coffee
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4 large eggs, separated
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1/2 cup to 2/3 cup, plus 1 tablespoon sugar (see notes above)
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2 tablespoons dark rum
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1 tablespoon water
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Pinch of salt
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1 teaspoon vanilla extract
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Dark chocolate for shaving over top, optional