Fresh steamed chow mein/chinese noodles are only partially cooked and can be found in the refrigerated section at most Asian markets. Cook them a few minutes in boiling water (still firm though), strain and rinse with cold water.
If you can't find fresh chow mein noodles, then use the dried noodles by cooking them first and remove about 1 minute before the package directions. Drain them and rinse with cold water.
Lo Mein Sauce - if you can't find it, you can make it by mixing: 2 TBS reduced sodium soy sauce,
2 tsp sugar, 1 tsp sesame oil, 1/2 tsp ground ginger, and 1/2 tsp Sriracha. Use in recipe in place of the sauce.