INGREDIENTS
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1/2 stick (1/4 cup) unsalted butter, softened
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1/2 teaspoon finely grated fresh orange zest
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1 1/2 teaspoons fresh orange juice
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1/8 teaspoon salt
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1 1/2 cups all-purpose flour
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3 tablespoons sugar
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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1 1/2 cups well-shaken buttermilk
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3 tablespoons unsalted butter, melted
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2 large eggs
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1 teaspoon vanilla
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1 ripe large banana
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1/2 cup salted roasted macadamia nuts (2 1/2 oz), chopped
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Accompaniment: maple syrup