INGREDIENTS
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3 ounces fine-quality semisweet chocolate
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1 1/2 cups hot brewed coffee
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3 cups sugar
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2 1/2 cups all-purpose flour
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1 1/2 cups unsweetened cocoa powder (not Dutch process)
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2 teaspoons baking soda
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3/4 teaspoon baking powder
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1 1/4 teaspoons salt
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3 large eggs
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3/4 cup vegetable oil
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1 1/2 cups well-shaken buttermilk
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3/4 teaspoon vanilla
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Frosting
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1 1/2 cups (3 sticks) unsalted butter, room temperature
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1 cup cocoa powder
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4 1/2 cups powdered sugar
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1/2 to 3/4 cup heavy cream, more or less as needed
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1 1/2 teaspoons vanilla extract