Although Tom Kha Kai is another variation of chicken soup, it deserves the No.4 because of its unparalleled taste and popularity. Similar to Tom Yam Kai, the broth is prepared with many types of Thai herbs with the special addition of coconut milk that makes this soup unique. Though the soup is seasoned with chili, lime and fish sauce just like Tom Kha Kai, thanks to the coconut milk, the broth is milder and less spicy. This is probably more liked by non-spicy eaters.