INGREDIENTS
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Cake:
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3 tablespoons unsalted butter
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1 (6-ounce) box bittersweet chocolate
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1 ounce unsweetened chocolate
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4 eggs, separated
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1/3 cup sugar, divided
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1 teaspoon vanilla
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Icing:
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1 1/2 teaspoons instant espresso powder
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2 tablespoons hot water
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1/4 cup unsalted butter, at room temperature
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3 cups sifted powdered sugar, divided
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3 tablespoons sifted unsweetened cocoa
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1/2 teaspoon vanilla
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PREPARATION