Place a soup pot over medium-high heat. Pour 500 ml of water into the pot and add the lemongrass, galangal, shallot, coriander root, fresh chili, garlic, and kaffir lime leaves from the wooden mortar to the boiling water. Allow the herbs to simmer for about 5 minutes until they become fragrant.
Add the beef to the herbs and maintain the heat. Sprinkle in the salt and let the beef slowly simmer for about 20-30 minutes, allowing the flavors to combine.
Add the beef to the herbs in the pot and maintain the heat. Sprinkle in the salt and let the beef slowly simmer for about 20-30 minutes, allowing the flavors to combine.