Combine the sauce ingredients in a small dish or measuring cup and set aside.
For The Lo Mein
Bring a large pot of water to a boil and have noodles ready to go in. Noodles should only take 4 minutes to cook, and you want to add the cooked noodles right to the wok, so plan accordingly.
In a separate large wok or skillet heat the vegetable oil over medium-high heat. Add in the mushrooms and celery and cook until softened slightly, about 5 minutes. Add in the cabbage and cook an additional 2 minutes.
Toss in the garlic, bean sprouts and green onions and cook until fragrant, about 30 seconds.
Add in the cooked noodles and sauce and toss to combine, letting the sauce cook and thicken slightly, about 2 to 3 minutes. Serve and enjoy!