In a wok or large skillet, heat sesame oil, over medium-high heat.
Brown steak strips quickly, approx. 2 to 3 minutes.
Remove from skillet and set aside.
Add remaining ingredients to skillet and heat to a simmer over medium heat.
Thicken sauce using 2 tsp. cornstarch and water to dissolve the cornstarch.
Simmer 1 minute.
Add the beef to the sauce and toss to coat.
Serve over rice or vermicelli noodles.