INGREDIENTS
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1 cup (2 sticks) unsalted butter, at room temperature?
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2 vanilla beans, split lengthwise*?
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2/3 cup vanilla sugar**?
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2 large egg yolks?
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1 tablespoon vanilla extract?
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2¼ cups all-purpose flour?
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½ teaspoon salt
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To finish:?
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Turbinado sugar for coating (about ¾ cup)?
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1 large egg white mixed with 1 tablespoon water