Thailand. Tom yam is pan-Thai — the combination of lemongrass, galangal, and kaffir lime leaf is the aromatics of central and northeastern Thai cooking. The kung (prawn) version is the most internationally known, but tom yam is also made with fish (tom yam pla), chicken, and mushrooms.
Tom yam kung (spicy prawn soup) is the most internationally famous Thai soup — hot, sour, and aromatic. The broth is clear and intensely flavoured with lemongrass, galangal, kaffir lime leaf, and bird's eye chillies. It is not a cream soup — tom yam nam kon (creamy version with evaporated milk) is a variation; the original is clear, bold, and uncompromising.
Singha lager or a cold Leo (the Thai budget lager) — the carbonation cleanses the chilli heat and the mild lager does not compete with the aggressive aromatic soup. Ice water is also appropriate — the heat demands it.
{"Tiger prawns (kung) with heads on: the heads are the flavour source — crush them in the broth, let them steep for 10 minutes, then discard. The orange fat and juices from the heads give the broth its characteristic colour and richness","Aromatic base: bruised lemongrass (cut into 5cm pieces, bruised with the back of a knife), sliced galangal (not ginger — galangal has a medicinal, piney flavour that ginger cannot replicate), kaffir lime leaves torn","Tom yam paste: Nam Prik Pao (roasted chilli paste), a tablespoon stirred into the broth — this adds depth, smokiness, and a darker background flavour","The sour: fresh lime juice added off the heat — never cooked. The volatile citrus oils dissipate immediately in boiling broth","Fish sauce: Tiparos, added to taste — the saltiness balances the sourness of the lime","Bird's eye chillies: bruised (not cut), added at the start — they release heat without the seeds producing excessive grassiness"}
The moment where tom yam lives or dies is the final balance check. Before serving, taste the broth: it should be simultaneously hot (chilli), sour (lime), salty (fish sauce), and aromatic (lemongrass-galangal-kaffir lime). If any element is absent or dominant, adjust. Add lime juice for more sour. Add fish sauce for more salt. Add more bruised chilli for heat. Add a bruised lemongrass stalk for more aroma. The balance is not fixed — it is arrived at fresh each time.
{"Cooking after adding lime juice: the sour brightness disappears. Add lime juice off heat immediately before serving","Using ginger instead of galangal: the flavour profile changes significantly — galangal provides the medicinal, camphor note that defines the soup","Not using prawn heads: the broth made from headless prawns is flat and lacks depth"}