Use a mortar and pestle to pulverize the Thai chilis, garlic, shallots, and lemongrass into a paste.
Add some cooking oil into a pot and add in the paste. Stir it around until its aromatic.
Next, add in the lime leaves and 1 stalk of lemon grass.
Add in the catfish, and stir for a few minutes. Next, add boiling water into the pot to fill it. Bring it to a boil.
Next add MSG and salt.
Rinse the bamboo shoots in warm water to rinse. Add it into the pot. Stir it up.
Note: If you use fish, you don’t want to mix it too much.
Bring it down to medium low and allow it to simmer for 15 minutes.
Add in the tomatoes and green onions. Allow it to simmer for another 5 minutes.
Add fish sauce
Add the lemon basil and serve