In a wok or large frying pan heat the oil over high heat until very hot. Add the bok choy and stir-fry until they begin to soften slightly, 1 to 2 minutes. Add the soy sauce, vinegar and sesame oil and cook until just done, 1 to 2 minutes longer. Sprinkle with sesame seeds and serve.
2006, Ellie Krieger, All Rights Reserved