INGREDIENTS
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For the cake:
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1/2 cup butter, at room temperature
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1/2 cup sugar
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1/2 cup packed light brown sugar
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3 eggs, separated
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1 1/2 ounces unsweetened chocolate, melted and cooled
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1 2/3 cup all-purpose flour
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3 tablespoons Dutch-processed cocoa powder
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1/2 teaspoon baking soda
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1/4 teaspoon baking powder
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1/4 teaspoon kosher salt
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1/2 cup buttermilk
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1 teaspoon vanilla
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1/2 cup shredded sweetened coconut
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1/3 cup finely chopped pecans
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2 tablespoons crushed cocoa nibs
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For the frosting:
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1 cup shredded sweetened coconut
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1/2 cup finely chopped pecans
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1 cup (about 6 ounces) semi-sweet chocolate, chopped (I used chips)
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1/4 cup butter
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1/2 cup sour cream
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1 teaspoon vanilla
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3 cups powdered sugar