INGREDIENTS
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6 ounces (170g) bittersweet or semisweet chocolate, chopped
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6 ounces (170g) unsalted butter, cut into small pieces
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1/4 cup (60ml) dark-brewed coffee
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4 large eggs, separated
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2/3 cup (170g), plus 1 tablespoon sugar
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2 tablespoons (30ml) dark rum
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1 tablespoon (15ml) water
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pinch of salt
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1/2 teaspoon vanilla extract