INGREDIENTS
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2 tablespoons unsalted butter, softened
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1/2 cup plus 1 tablespoon unsweetened cocoa powder
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3 cups all-purpose flour
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1 1/2 cups granulated sugar
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2 teaspoons baking soda
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1 teaspoon salt
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1 teaspoon ground cinnamon
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2 cups freshly squeezed orange juice, plus 2 tablespoons finely grated zest
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3/4 cup mayonnaise
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2 tablespoons balsamic vinegar
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1 teaspoon vanilla extract
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1 cup confectioners' sugar
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2 tablespoons unsweetened cocoa powder
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2 tablespoons freshly squeezed orange juice