Step 1

Bring a large pot of lightly salted water to a boil. Add the bean sprouts, and cook uncovered until tender yet still crisp, about 15 seconds. Drain in a colander, then immediately immerse in ice water for several minutes until cold to stop the cooking process. Once the bean sprouts are cold, drain well, and set aside.

Step 2

Whisk soy sauce, sesame oil, chile powder, garlic, and sesame seeds together in a large bowl. Stir in bean sprouts and toss until well coated with the sauce. Sprinkle with green onions and season with rice wine vinegar. Refrigerate before serving.