is a clear soup with beef, yellow sweet potatoes and holy basil. The broth is seasoned with fish sauce, tamarind, lime and
chilis and has a sour-spicy flavour profile. The soup originates from the royal court and is said to have been invented in the early 20th century by Princess
Yaovabha Bongsanid, the daughter of King Chulalongkorn (Rama V.).
