In a small saucepan, warm up the oil then place in the remaining sauce ingredients and let this simmer for about 10 minutes. I put this on low and let it continue to warm while I cooked the steak.
Slice the steak against the grain in 1/4 inch slices that are bite size.
Place the steak in a Ziploc bag with the corn starch, seal, and shake to coat the steak. Alternatively, this can also be done in a large bowl.
In a large skillet, heat 2 Tbsp of oil on medium-high heat and cook the steak until it is medium-well or lightly pink. This will take about 6-8 minutes.
Carefully place the steak on a paper towel-lined plate so the oil can drip out and rinse the skillet.
Place the steak back into the skillet on medium-high heat and carefully pour in the sauce. Stir or flip the steak occasionally so that it does not stick.
Let this cook for 8-10 minutes until the sauce was completely soaked into the steak. In the final 1-2 minutes, add the sliced green onions.
Once the steak is nice and coated serve it on top of cooked rice with additional green onions.
Notes
This can be made 'not' gluten-free by using regular soy sauce.