INGREDIENTS
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1 tablespoon unsalted butter
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2/3 cup superfine sugar, plus more for dusting
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2 eggs, separated
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2/3 cup reduced fat buttermilk
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2 tablespoons lemon juice
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1 tablespoon lemon zest
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1/4 cup all-purpose flour
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1/4 teaspoon salt
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1 cup fresh raspberries
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1 cup fresh blueberries
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1 cup fresh blackberries
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2 tablespoons confectioners' sugar