In a large bowl, whisk together the marinade ingredients until well-blended and smooth.

Thinly slice the flank or skirt steak against the grain and marinate it in the prepared mixture for at least 2 hours.

Preheat your wok over high heat until it begins to smoke lightly.

Sear half of the marinated beef in the hot wok undisturbed for about 3 minutes, then stir-fry until cooked.

Garnish the cooked beef with sesame seeds and serve with steamed rice and fresh vegetable sides.