INGREDIENTS
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FOR THE CAKE:
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16 tablespoons unsalted butter in 16 pieces (plus 1 tablespoon softened butter for greasing pan)
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2 1/2 cups all-purpose flour (more for pan)
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2 cups sugar
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1 teaspoon baking soda
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1/4 teaspoon salt
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1/4 cup cocoa
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1/2 cup buttermilk
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2 eggs, lightly beaten
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1 teaspoon vanilla
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FOR THE FROSTING:
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8 tablespoons unsalted butter in 8 pieces
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1/4 cup cocoa
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6 tablespoons buttermilk
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1 teaspoon vanilla extract
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1/4 teaspoon salt
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1 pound confectioners' sugar
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1/2 cup chopped walnuts or pecans