Tianjin Bok Choy with Braised Mushrooms

Tianjin bok choy, familiarly known as napa cabbage, is widely available in markets. A ubiquitous vegetable in the Chinese kitchen, it is found in dim sum dumplings, stir-fries, soups, and in cool dishes, such as this preparation. Considered a salad by the Chinese, this dish can be eaten either as the first course of a larger meal or as a main course of a small family dinner.