Tom jap chai is a Chinese based vegetable soup prepared by slow boiling cabbage and mustard greens (or any other leafy greens of choice) for hours until the vegetables become very soft and nearly disintegrate into the soup.
As common in many Thai dishes, the usage of pork in the broth (or chicken) gives the soup its ultimate meaty flavor. Tam jap chai is not at all spicy, but offers great flavor from the long cooking mingle of vegetables and meat.