Pechay is a cabbage. It is one of the most known vegetables in the Philippines. It is also known as one of the oldest green vegetables in Asia. In the United States, this vegetable is popularly known as bok choi. The Pechay differs in many aspects from other (for instance European) cabbages. The leaves of the Pechay vary in length from 10 to 30 cm. The leaves are green and mild flavored and less crisp than other cabbages.