Beef Lo Mein

Ingredients:

For the Beef:
1 lb beef sirloin, thinly sliced
2 tablespoons soy sauce
1 tablespoon cornstarch
1 tablespoon vegetable oil
For the Lo Mein:
8 oz lo mein noodles or spaghetti
2 tablespoons vegetable oil
1 onion, thinly sliced
2 cloves garlic, minced
1 cup sliced carrots
1 cup sliced bell peppers (red, green, or yellow)
1 cup broccoli florets
1 cup snow peas
1/4 cup soy sauce
2 tablespoons oyster sauce
1 teaspoon sesame oil
1/4 cup beef broth
1 tablespoon cornstarch mixed with 1 tablespoon water (slurry)
Green onions, chopped (for garnish)
Sesame seeds (optional, for garnish)