Cook pasta in a large pot of salted water, according to package directions. Drain and return to pot. Add one and a half tablespoons sesame oil and toss to coat. Set aside.

Meanwhile, heat remaining two tablespoons sesame oil in heavy pot over medium-high heat. Add scallions, carrots, snow peas, red pepper, broccoli, garlic and ginger. Sauté until vegetables soften, about four minutes.

Add honey, peanut butter, soy sauce, rice vinegar and chili sauce and mix well. Simmer sauce two minutes.

Pour sauce over pasta and toss well. Transfer to platter and serve warm, garnished with additional scallions.