Thin noodles are dressed in a fragrant caramelized scallion oil with soy sauce for a dish of elegant simplicity. This vegetarian Shanghai family classic proves that the best flavors often come from the humblest ingredients.
Wash, dry, and trim the scallions. Slice only the green parts into long thin strips, reserving the whites for other use.
Heat the neutral oil in a medium skillet over medium heat for 1–2 minutes until shimmering but not smoking.
Add all scallion greens and gently fry over medium-low heat, stirring frequently, until deeply browned and caramelized at the edges (12–15 minutes for maximal aroma).
While the oil infuses, boil the dried wheat noodles in a large pot of salted water according to package directions until just al dente. Drain immediately but do not rinse.
Add sugar, salt, light soy sauce, and dark soy sauce to the hot scallion oil and let sizzle for 30–40 seconds, stirring constantly, then turn off the heat.
Toss noodles and scallion oil sauce together rapidly while hot, ensuring every strand is thoroughly coated. Serve immediately, topping each bowl with extra caramelized scallions.