Central Thai — considered a national dish; the name literally means 'boiled galangal chicken'
Tom kha is the coconut-rich counterpart to tom yum — the same aromatic base (galangal, lemongrass, kaffir lime leaves) but poached in coconut milk rather than clear broth, creating a soup that is silky, fragrant, and less aggressive than tom yum. The galangal ('kha' gives the soup its name) is the dominant aromatic — it must be fresh, young, and sliced in 5mm rounds so it infuses efficiently without becoming too dominant. Chicken thigh (skin-on for fat, on the bone for flavour) is the traditional protein. Oyster mushrooms or straw mushrooms complete the dish. Like tom yum, lime juice and fish sauce are calibrated off-heat — the boiled-lime problem applies equally here.
Tom kha achieves the rare combination of comfort and complexity — the coconut richness is warming and familiar; the galangal and kaffir lime provide medicinal-aromatic edge; the lime and chilli sharpen the finish. It is simultaneously restorative and stimulating.
{"Use thin coconut milk or a mix of first and second extraction — too thick makes the soup cloying","Galangal is the central flavour, not lemongrass — use generously and cut 5mm thick","Simmer, never boil — coconut milk will separate irreversibly at a rolling boil","Chicken thigh over breast — the fat renders into the soup and the connective tissue enriches the broth","Lime and chilli off heat; fish sauce can be added during cooking"}
For a cleaner, more fragrant soup, do not add the coconut milk to the broth — build the aromatic infusion in water or stock first, strain out the aromatics, then add coconut milk separately and heat gently. This prevents the risk of boiling the coconut milk during the aromatic infusion stage.
{"Boiling the coconut milk — once it separates, the greasy, grainy texture cannot be recovered","Adding lime juice while still on the burner — same problem as tom yum: bitter and flat","Using galangal powder or dried galangal — the fresh camphor-piney volatile oils are what defines tom kha","Under-using galangal — the dish should taste distinctively of galangal, not generically of coconut and lemongrass"}