This can be prepared a day ahead. The bit of tahini (sesame paste) creates a creamy sauce that contrasts well with the crisp vegetables. In a large bowl, combine cilantro, tahini, miso, oil, orange juice, and red pepper flakes. Toss in green onions, bell pepper and noodles. Cover bowl with plastic wrap, and chill 3 hours or overnight. Serve cold. From an article by Mary Carroll in The San Mateo Times, 5/25/93.