INGREDIENTS
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For the cake:
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1 & 1/4 cups unsalted butter
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2 cups all-purpose flour
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1 & 1/2 cups granulated sugar
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1/2 cup packed light brown sugar
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3/4 teaspoon salt
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1 cup water
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1/2 cup buttermilk
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1 teaspoon vanilla extract
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2 large eggs
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For the frosting:
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1/2 cup unsalted butter, softened
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3 cup confectioners' sugar, sifted
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6 to 8 tablespoons sour cream
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1 cup toasted nuts, chopped*