
Combine marinade ingredients. Cut steak into bite sized pieces and add to marinade.
Refrigerate 30 minutes or up to 2 hours. Remove from marinade allowing excess to drip off. (Discard remaining marinade).
Preheat a large skillet over medium-high heat. Add 1 tablespoon vegetable oil.
Add steak in a single layer and cook 2-3 minutes without stirring to get a crust on one side. Stir and cook 1 minute more. Do not overcook.
Remove from heat, toss with butter. Garnish with sesame seeds and green onions if desired. Serve immediately