1. Pour water and lemongrass into a pot and boil.
2. Add Tom Yum Goong sauce and octopus and continue to boil.
3. Add the okra and cook for a while.
4. Then add the mushrooms.
5. Add small peppers.
6. Add shrimp.
7. Pour in acid powder.
8. Add fish sauce.
9. Finally, add tomatoes, then add a little salt and chicken essence.