1. Heat water, turn on medium heat, add Tom Yum machine and salt.
2. Wait for the water to boil and add the canned fish. *No need to stir, the fish won't be mushy*
3. Wait for it to boil again, add mushrooms, add fish sauce.
4. Before serving, add lime, bird's eye chilli, fish sauce and season to taste. Sprinkle with coriander and ready to eat.