"This four-layer stunner may just render all your other chocolate-cake recipes obsolete. A generous amount of sour cream keeps the cake layers tender, and the frosting is a glossy triumph. It's a natural fit for practically any get-together?from a simple family birthday celebration to an elaborate dinner party...."
INGREDIENTS
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5 ounces fine-quality unsweetened chocolate, chopped
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2 1/4 sticks unsalted butter, softened
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2 3/4 cups sifted cake flour (not self-rising; sift before measuring)
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1/4 cup unsweetened cocoa powder (not Dutch-process)
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2 teaspoons baking soda
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1 teaspoon baking powder
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1/2 teaspoon salt
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4 large eggs, at room temperature 30 minutes
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1 cup granulated sugar
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1 cup packed light brown sugar
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1 1/2 teaspoons pure vanilla extract
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2 cups sour cream
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1 cup sugar
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6 tablespoons all-purpose flour
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6 tablespoons unsweetened cocoa powder (not Dutch-process)
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1 1/2 cups whole milk
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4 ounces fine-quality unsweetened chocolate, finely chopped
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1 tablespoon pure vanilla extract
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6 sticks (1 1/2 pound) unsalted butter, at room temperature