Vegan

Rinse and drain the mung bean sprouts 1–2 hours before cooking.
Cut the seitan into thin strips.
Combine seitan with the marinade: finely-chopped shiitake mushrooms, sesame oil, 1 tsp soy sauce, salt, pepper and 1/2 tsp cornstarch.
Marinate the seitan for 20–25 minutes.
Dissolve 1 tablespoon cornstarch in 4 tablespoons water for the sauce.
Whisk 1/4 cup water or vegetable broth with 1 tbsp soy sauce, salt, pepper and the cornstarch mixture; set the sauce aside.
Soften the wonton noodles in boiling salted water, plunge into cold water, and drain thoroughly.
Wash and prepare the vegetables: slice celery, bok choy/broccoli, mushrooms, bell pepper; chop the onion and dice the green onion.
Heat a wok or frying pan over medium-high to high heat.
Add 2 tablespoons vegetable oil to the hot pan.
Fry the noodles in batches until golden; remove and set aside.
Heat 2 tablespoons oil in the pan.
Add the red onion and marinated seitan (reserve any remaining marinade) and stir-fry until browned and nearly cooked; remove and set aside.
Stir-fry the celery until tender, seasoning with a little salt; remove and set aside.
Stir-fry the bok choy or broccoli, add 1/4 cup water and cover until cooked; remove and set aside.
Stir-fry the mushrooms until tender; remove and set aside.
Stir-fry the red bell pepper until tender; remove and set aside.
Give the prepared sauce a quick re-stir.
Return the seitan and cooked vegetables to the wok.
Make a well, add the sauce and any remaining marinade, and stir quickly to thicken and combine.
Stir in the diced green onion.
Pour the vegetable and sauce mixture over the cooked noodles.
Garnish the chow mein with the toasted sesame seeds.
Serve hot.
This recipe is adapted from Wikibooks. It is licensed under Creative Commons Attribution-ShareAlike 4.0 International.