Chilled wheat noodles are dressed in a bold sauce of chili oil, Sichuan peppercorn, and black vinegar. This fresh, vegetarian-adaptable dish is a refreshing family favorite during warm months.
Boil a large pot of water and cook the wheat noodles according to package directions until al dente; avoid overcooking for best texture.
While noodles cook, julienne the cucumber and thinly slice the scallions; set these aside for garnish.
Drain noodles and immediately rinse under cold running water to stop the cooking and chill thoroughly; toss with a little sesame oil to prevent sticking.
In a mixing bowl, combine soy sauce, black vinegar, chili oil, sugar, Sichuan peppercorn powder, minced garlic, and salt; stir until sugar dissolves and mixture is fragrant.
Toss chilled noodles with the prepared sauce until evenly coated, then gently fold in half the cucumber and scallions.
Divide noodles into individual bowls, top with remaining cucumber, scallions, and roasted peanuts for crunch. Serve immediately, chilled, for best flavor.