Mash the turmeric, galangal, garlic, and lemongrass roughly to release the fragrance.
Slice the galangal and mash the garlic with a knife.
Peel the outer leaves of the lemongrass and cut into shorter pieces, then mash.
Chop the chicken into small pieces.
Bring 1.5L of water to a boil in a pot.
Add the turmeric, galangal, garlic, red onion, lemongrass, and kaffir lime leaves to the boiling water.
Once boiling again, add the chicken and let simmer for 15 minutes.
Remove the foam from the surface of the soup.
Turn off the heat and add the tamarind paste and chilis (if using).
Garnish with coriander and extra kaffir lime leaf.
