Find fish sauce in the Asian foods section of the supermarket.
Cook pasta according to package directions. Drain, rinse, and place in a large bowl; set aside.
Process cilantro and next 7 ingredients in a food processor until smooth, stopping to scrape down sides.
Toss together pasta, cilantro dressing, carrots, and next 3 ingredients. Sprinkle with peanuts, and serve immediately.
* Soy sauce may be substituted for fish sauce.
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