- Cook vermicelli according to package directions. Drain and rinse immediately under cold water to cool; drain well.
- Combine noodles, cucumber, radishes, cilantro and green onion in large serving bowl. Cover and refrigerate 2 hours, or until thoroughly chilled.
- Meanwhile, blend peanut butter, vinegar, soy sauce and salt. Stir in soymilk until well blended. Cover and refrigerate.
- Just before serving, pour peanut butter dressing over noodle mixture and toss together until all pieces are evenly coated.