In the modern popularized versions the soup contains also mushrooms - usually straw mushrooms or oyster mushrooms. The soup is often topped with generous sprinkling of fresh chopped cilantro (coriander leaves). Sometimes Thai chili jam (nam phrik phao, Thai: น้ำพริกเผา) is added: this gives the soup a bright orange color and makes the chili flavour more pronounced.
The Royal Lao version of tom yam includes a pinch of rice in the soup.