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01In a large pot, bring 4 quarts water to a boil. Add the noodles and cook, stirring once or twice, until tender. Reserve about ½ cup of the cooking water, then drain in a colander. Rinse under running cold water until fully cooled, then drain again; set aside
02In a large bowl, whisk together the tahini, lemon juice, soy sauce, sesame oil, sugar, ¼ teaspoon each salt and pepper, and 3 tablespoons of the reserved cooking water; the mixture should have the consistency of thin yogurt (if too thick, whisk in additional water 1 teaspoon at a time to thin).
03Add the udon to the tahini mixture and toss until evenly coated. Taste and season with salt and pepper. Serve sprinkled with the scallions and sesame seeds.