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Preheat oven to 400°; lightly butter a baking sheet.
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In a bowl, mix the flours, sugar, baking powder, caraway seeds, baking soda, and salt together.
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Cut butter into ½-inch cubes; sprinkle them over the flour mixture.
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Using a pastry blender, cut in the butter until the mixture looks like coarse crumbs.
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Stir in the buttermilk and knead until combined; knead in currants, if using.
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With lightly floured hands, pat the dough into a ½ inch thickness on a lightly floured cutting board.
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Using a 2 ½ inch round biscuit cutter or glass, cut out rounds from the dough.
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Gather the scraps together and repeat until all the dough is used.
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Place rounds on the prepared baking sheet; bake 15-17 minutes, or until lightly browned.
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Remove baking sheet to a wire rack; cool 5 minutes.
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Using a spatula, transfer scones to a wire rack to cool.
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Serve warm, or cool completely and store in an airtight container.