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1
In a 2-quart stainless steel saucier or 10-inch skillet, combine water and flour. Cook over medium heat, whisking constantly, until mixture comes together in a thick, mashed potato-like paste, about 2 minutes. Scrape onto a plate, spread into a 1-inch layer, and cool until no warmer than 100u00b0F (38u00b0C), about 20 minutes.
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2
Pulse flour, sugar, salt, and yeast in a food processor fitted with a metal blade. Once combined, add cooled yukone and water. Process until dough is smooth, about 90 seconds. Transfer to a lightly greased bowl (the dough will be slightly warm and incredibly sticky), cover with plastic, and refrigerate until roughly doubled in bulk, between 60 and 90 minutes depending on temperature of yukone.
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3
Turn dough onto a clean, un-floured surface, but do not deflate. Cut into 12 roughly equal portions (2 1/4 ounces or 60g each), cupping each beneath your palm and working in quick circular motions to form a smooth ball. Arrange on a parchment-lined half sheet pan, cover with plastic, and refrigerate overnight until puffy and soft, between 8 and 10 hours.
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4
Adjust oven rack to lower-middle position and preheat to 400u00b0F (204u00b0C). Fill a deep pot with about 3 inches of water and bring to a boil over high heat. Meanwhile, line a baking sheet or cutting board with a thick layer of paper towels. Cut parchment between each roll with a pair of scissors. Working with 4 dough pieces at a time, use parchment to lift and drop rolls into boiling water so that they are upside down. Boil exactly 60 seconds, then flip right side up with a slotted spoon (so the bottoms can skin over) and transfer to paper towels. (Along the way, the parchment squares can be gently tugged free or allowed to slip off on their own.) Arrange rolls on a parchment-lined half sheet pan; these can be baked immediately or left at room temperature up to 4 hours. Bake until blistered and golden brown all over, about 35 minutes.
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5
Rolls can be served immediately or held at room temperature for up to 6 hours. Reheat in a hot oven for 5 to 10 minutes before serving if rolls have cooled and you prefer them hot.
