Step 1

Add baking soda, cornstarch, soy sauce and mirin to a large ziplock bag.

Step 2

Add strips of flank steak to the bag.

Step 3

Toss well to coat the beef, then place in the refrigerator for 30-60 minutes.

Step 4

Prepare the sauce by whisking all of the ingredients together in a small bowl. Set aside.

Step 5

Once the steak has tenderized for 30-60 minutes in the refrigerator, remove it from the fridge.

Step 6

Bring a large pot of water to boil on the stove.

Step 7

Add the lo mein noodles to the boiling water and cook for 4 minutes.

Step 8

Drain and set aside.

Step 9

While the noodles are cooking, add the canola oil to a large skillet or wok on the stove over high heat.

Step 10

Remove the steak from the marinade, shake off any additional marinade, then add the steak to the skillet.

Step 11

Cook for 2-3 minutes.

Step 12

Remove the steak from the skillet and set aside.

Step 13

Add the onion, bell pepper, asparagus and garlic, stir fry for 3-4 minutes.

Step 14

Add the beef back to the skillet, along with the cooked lo mein noodles and sauce.

Step 15

Toss to combine everything, remove from the heat and top with the sesame seeds and diced green onions.