Cook pasta according to package directions, omitting salt and fat; drain. Combine pasta and sesame oil, tossing well to coat.
While pasta cooks, heat peanut oil in a large nonstick skillet over medium-high heat. Add the ginger and garlic; sauté 30 seconds. Add broccoli and onion; sauté 3 minutes. Add steak, and sauté 5 minutes or until done. Add pasta mixture, soy sauce, and remaining ingredients; cook 1 minute or until lo mein is thoroughly heated, stirring constantly.