Preparation Toss ginger, garlic, and two-thirds of the scallions in a large bowl to combine. Heat grapeseed oil in a small saucepan over high until hot and shimmering but not smoking, about 2 minutes. Immediately pour hot oil over aromatics. The scallions will sizzle, turn bright green, and wilt almost immediately. Let sit 5 minutes. Mix soy sauce, vinegar, sesame oil, pepper, sugar, and remaining scallions into oil mixture; season with salt. Let sit 15 minutes for flavors to meld. Taste sauce and season with more salt if needed. Meanwhile, cook noodles according to package directions; drain. Toss noodles in a large bowl with as much or little sauce as you’d like. Divide among bowls and sprinkle with sesame seeds. Serve with chili oil alongside.
Preparation Toss ginger, garlic, and two-thirds of the scallions in a large bowl to combine. Heat grapeseed oil in a small saucepan over high until hot and shimmering but not smoking, about 2 minutes. Immediately pour hot oil over aromatics. The scallions will sizzle, turn bright green, and wilt almost immediately. Let sit 5 minutes. Mix soy sauce, vinegar, sesame oil, pepper, sugar, and remaining scallions into oil mixture; season with salt. Let sit 15 minutes for flavors to meld. Taste sauce and season with more salt if needed. Meanwhile, cook noodles according to package directions; drain. Toss noodles in a large bowl with as much or little sauce as you’d like. Divide among bowls and sprinkle with sesame seeds. Serve with chili oil alongside.