INGREDIENTS
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4 cups self-rising flour, plus more for the work surface
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2 tablespoons baking powder
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1 teaspoon baking soda
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3/4 pound (3 sticks) salted butter, cold, cut into 1/2-inch pieces or grated
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2 large eggs, beaten, plus 1 large egg for brushing
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1 1/2 cups buttermilk, or as needed, plus 1 tablespoon for brushing
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Strawberry jam or gravy, for serving (optional)