INGREDIENTS
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1 cup butter
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1 cup water
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4 tablespoons unsweetened cocoa powder
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2 cups all-purpose flour
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2 cups white sugar
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1/2 teaspoon salt
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2 eggs
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1/2 cup sour cream
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1 teaspoon baking soda
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1/2 cup butter
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4 tablespoons unsweetened cocoa powder
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5 tablespoons milk
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4 cups confectioners' sugar
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1 teaspoon vanilla extract
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1 cup chopped walnuts