INGREDIENTS
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1/2 cup unsalted butter, cold, plus 1 tablespoon
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1 1/2 cups cake flour
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3/4 cups all-purpose flour, divided, plus more for work surface
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3 teaspoons baking powder
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1/2 teaspoon baking soda
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1 1/4 teaspoons sea salt, divided
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2 tablespoons shortening, cold
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1 cup buttermilk