INGREDIENTS
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½ cup buttermilk
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1 teaspoon baking soda
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½ pound (2 tablespoons) unsalted butter, cut into large chunks
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1 cup Coca-Cola
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¼ cup unsweetened alkalized cocoa powder
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2 cups bleached all-purpose flour
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2 cups superfine sugar
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½ teaspoon salt
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2 large eggs
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2 teaspoons vanilla extract
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3 ¾ cups plus 2 tablespoons confectioners’ sugar
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Large pinch of salt
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1 stick butter, melted and cooled to tepid
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2 ounces unsweetened chocolate, melted and cooled to tepid
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1 ¼ teaspoons vanilla extract
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6 tablespoons Coca-Cola, at room temperature
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4 cups confectioners’ sugar, or more if needed
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⅛ teaspoon salt
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6 ounces unsweetened chocolate, melted and cooled to tepid
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2 ½ teaspoons vanilla extract
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½ cup plus 1 tablespoon milk, heated to tepid
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8 tablespoons (1 stick) unsalted butter, softened