"This devilishly delicious all-occasion cake recipe was adapted from "Martha Stewart's Baking Handbook," and the frosting recipe is courtesy of Matt Lewis of Baked...."
INGREDIENTS
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1 1/2 cups (3 sticks) unsalted butter, room temperature, plus more for pans
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3/4 cup Dutch-process cocoa powder, sifted, plus more for pans
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3/4 cup hot water
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3/4 cup sour cream
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3 cups cake flour, (not self-rising), sifted
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1 teaspoon baking soda
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1/2 teaspoon salt
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2 1/4 cups sugar
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4 large eggs
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1 tablespoon pure vanilla extract
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8 ounces bittersweet chocolate
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8 ounces milk chocolate
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1 1/2 cups heavy cream
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2 tablespoons corn syrup
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3 sticks unsalted butter, soft but cool, cut into 1-inch pieces