INGREDIENTS
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2 1/2 cups all-purpose flour (spooned and leveled), plus more for work surface
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1/4 cup granulated sugar
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1 tablespoon baking powder
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1/2 teaspoon coarse salt
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1/2 cup (1 stick) cold unsalted butter, cut into small pieces
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1/2 cup plus 2 tablespoons buttermilk
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1 tablespoon finely grated orange zest plus 1/4 cup orange juice (from 1 orange)
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1 large egg yolk
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1 1/2 teaspoons poppy seeds
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Coarse or sanding sugar, for sprinkling
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Butter and fruit jam (optional), for serving