INGREDIENTS
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■2 medium zucchini, trimmed and grated (I grated mine on the medium holes of a box grater)
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■9 tablespoons of unsalted butter, at room temperature, divided
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■2-3/4 cup flour
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■1/4 cup unsweetened cocoa, sifted
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■1-1/4 teaspoon baking soda
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■1 teaspoon salt
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■1-1/2 cup sugar
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■1/2 cup vegetable oil
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■2 eggs
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■1 teaspoon vanilla extract
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■1/2 cup buttermilk *
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■1/4 cup confectioners' sugar