"Buttermilk keeps this moist cake light and flavorful. Dust it with powdered sugar as it cools for a sweet, decorative finish...."
INGREDIENTS
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3/4 cup (1 1/2 sticks) unsalted butter, room temperature, plus more for pan and parchment
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2 1/3 cups cake flour (sifted, then measured) plus more for pan
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2 1/2 cups (10 ounces) fresh blackberries
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1/4 cup plus 1 1/3 cups sugar
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1 1/2 teaspoons baking powder
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3/4 teaspoon salt
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1/2 teaspoon baking soda
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3 large eggs, room temperature
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2 teaspoons vanilla extract
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1 1/2 teaspoons finely grated orange zest
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1 cup well-shaken buttermilk
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Powdered sugar (for dusting)
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Special equipment: Use a 9"10"-diameter springform pan.