"A favored duo, chocolate and coconut come together in this tunnel-style Bundt cake that's part sticky, moist macaroon cookie, and part rich, tender chocolate cake. Each deep-dark slice of cake sports a thick coat of chocolate ganache and a hidden channel of pure white coconut filling for a deliciously decadent treat...."
INGREDIENTS
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***FILLING***
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2 large egg whites
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1/4 teaspoon cream of tartar
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1/8 teaspoon salt
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1/2 cup confectioners' sugar
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1/8 to 1/4 teaspoon coconut flavor, or 2 teaspoons vanilla extract
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2 cups shredded or flaked sweetened coconut
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2 tablespoons King Arthur Unbleached All-Purpose Flour
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***CAKE***
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1 1/2 cups King Arthur Unbleached All-Purpose Flour
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1 cup King Arthur Triple Cocoa Blend or Dutch-process cocoa
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3/4 teaspoon salt
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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2 teaspoons espresso powder, optional; to enhance chocolate flavor
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2 tablespoons King Arthur Cake Enhancer, optional; for moistness
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1/2 cup (8 tablespoons) unsalted butter, at room temperature
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1 1/2 cups granulated sugar
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1 large egg plus 2 large egg yolks (reserved from the filling)
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2 teaspoons vanilla extract
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1 1/4 cups milk
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***GANACHE***
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1/4 cup heavy cream
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1/2 cup Guittard Semisweet Chocolate Wafers, or other good-quality semisweet chocolate