INGREDIENTS
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1 medium Yukon Gold potato (about 6 ounces), scrubbed
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1 cup whole milk
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1/2 cup (1 stick) unsalted butter, melted, plus more for brushing
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1 1/2 cups all-purpose flour
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2 1/4-ounce envelopes active dry yeast (about 4 1/2 teaspoons)
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3 (heaping) tablespoons sugar
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2 large eggs, beaten to blend
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1 large egg yolk, beaten to blend
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2 2/3 cups (or more) bread flour
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1 tablespoon flaky sea salt, plus more
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Vegetable oil (for surface)
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A potato ricer