Turn your grill on to medium-high heat and let it heat up.
Thinly slice the meat and add to a large ziplock bag. Add the arrowroot powder to the meat and be sure each piece is lightly coated. Then add the coconut aminos and sesame oil. Let this marinate while you prep the veggies (about 10 minutes).
Get all your veggies into a large bowl. Boil a pot of water and cook noodles to the directions on the package.
Once your grill is heated, coat it in avocado oil or cooking spray. Add the meat to one side and the veggies to another. Let these cook for about 5 minutes then flip and cook the other side for another 5 minutes.
In the meantime, combine all the sauce ingredients to a bowl and whisk together.
When the noodles are finished cooking, add them to the grill with the meat and veggies. Then add the sauce and mix everything together. Let the lo mein cook for about 5 more minutes or until liquid is mostly cooked off.
Garnish with green onions and enjoy!
Notes
I recommend flank steak because it grills up quickly and is easy to slice thin. If you have another cut on hand, you can use that, just adjust cook time accordingly.
I like to use Lotus Noodles, but you can use whatever noodles you like. If you are doing a Whole30, I recommend using hearts of palm noodles.
If you don't have a flat top grill, you can always make this in your cast iron pan on the grill. You can also simply just make this on the stove top, as well.