Bok Choy is a common Chinese vegetable that has white stems with green leaves. Bok choy has a mild flavor and the white stems are always crisp. They come in different sizes but the one I love most is baby bok choy, which is about 3-4 inches (7-10 cm) in length. They are very versatile and can be used in stir-fries, soups, or to add texture and color to noodle dishes.