"In ‘Piece of Cake’ by Camilla Saulsbury..."
INGREDIENTS
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1/3 cup unsweetened cocoa powder (not Dutch process)
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 cup boiling water
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1 cup unsalted butter, cut into small pieces
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2 cups all-purpose flour
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2 cups sugar
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2 large eggs, at room temperature
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1/2 cup sour cream
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1/3 cup unsweetened cocoa powder
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1/2 cup unsalted butter, cut into small pieces
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1/2 cup sour cream
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1 teaspoon vanilla extract
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4 cups powdered sugar
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1 cup chopped toasted pecans (or walnuts)