INGREDIENTS
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3 tablespoons unsalted butter
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3/4 cup packed dark brown sugar
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3 medium ripe bananas, sliced
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2 cups all-purpose flour
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3/4 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup buttermilk
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3 tablespoons canola oil
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2 tablespoons rum
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2 large eggs
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1 tablespoon unsalted butter
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1/3 cup confectioners' sugar
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2 teaspoons half-and-half