1. Combine 1 tablespoon onions, 1 tablespoon sesame oil, 1 teaspoon fish sauce, and next 4 ingredients (through pork) in a large zip-top plastic bag; seal. Marinate in refrigerator 20 minutes.
2. Cook noodles according to package directions, omitting salt and fat. Drain.
3. Combine remaining 1 tablespoon oil, remaining 1 tablespoon fish sauce, vinegar, and chile paste in a large bowl, stirring well. Add noodles, cabbage, and bell pepper; toss to coat.
4. Heat a skillet over medium-high heat. Coat pan with cooking spray. Remove pork from marinade. Add pork to pan; cook 1 1/2 minutes or until done. Arrange pork over noodle mixture. Sprinkle with remaining 2 tablespoons onions.