How Many Ways Can You Say "Bok Choi/Choy"?
bok choy = Chinese chard = Chinese white cabbage = Chinese cabbage = Chinese mustard cabbage = pak choy = pak choi = baak choi = white mustard cabbage = yow choy = white celery mustard = taisai
Notes: Small heads of bok choy are called baby bok choy. Of the baby bok choys, bok choy sum = Canton bok choy has small yellow flowers (sum is the Chinese word for flower), while Shanghai bok choy is uniformly a bright, light green, doesn't have flowers, and isn't as sweet.
Is it good for you? Of course it is. Look at this: fat and cholesterol free, low in calories (about 10 for a 1 1/2 cups raw), and a good source of vitamin C (45% of daily requirements) and A (10%).
So do as ideath says. Everybody else always does!
Oh, and for a steamed, vinegared dish that uses bok choy see Penne with Chipotle Tofu, Vinegared Cabbages, Peppers and Onion.