1In 6- to 8-quart Dutch oven, heat 4 quarts water to boiling. Add noodles; return to boiling. Reduce heat; boil 13 to 14 minutes, adding bell peppers and carrots during last 4 minutes of cooking time, until noodles are tender. Drain; place in large bowl.
2Meanwhile, in food processor, place cilantro, lemon peel and garlic. Cover; process until very finely chopped. Add lemon juice, salt, pepper and oil. Cover; process until mixture forms a smooth puree.
3Pour cilantro sauce over noodle mixture; toss to coat evenly. Divide mixture into 4 individual serving bowls. Garnish with onion and cashews.