Cooking in
New York
Thai · Southern Thailand
Gaeng Som — Southern Sour Curry (No Coconut) / แกงส้ม
Gaeng som is the defining curry of Southern Thailand — sour, fiery, and turmeric-gold, with absolutely no coconut milk. The broth base is tamarind water (or green mango pulp, or fresh sour fruit depending on season and region) seasoned aggressively with fish sauce and the deep-fermented kapi that characterises the South. White fish (typically snapper, grouper, or the more traditional platu — short mackerel) is the standard protein. The technique is simple compared to coconut curries — paste is fried briefly, tamarind water added, fish added, and the whole thing simmered for 10–15 minutes. Speed is part of the ethos. The acidity is non-negotiable and should be bold rather than restrained.
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Cook
I
The Market List
The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.
For the paste
8–10
dried bird's eye chillies
soaked in warm water 10 minutes, drained
Not yet stocked in New York
1 tsp
dried turmeric
ground — not fresh
Origin · Javara, IndonesiaNot yet stocked in New York
1 tbsp
kapi (Southern Thai shrimp paste)
deep-fermented; not substituted with milder pastes
Not yet stocked in New York
4 cloves
garlic
roughly chopped
Your own market
3
shallots
roughly chopped
Your own market
1 tsp
salt
Your own market
100 g
tamarind block
extracted in 750 ml warm water, strained — not concentrate
Not yet stocked in New York
600 g
white fish — snapper, grouper, or platu (short mackerel)
cut into steaks or large pieces
Your own market
150 g
green beans
trimmed, cut into 4 cm lengths
Not yet stocked in New York
150 g
cabbage or Thai eggplant
cut into bite-sized pieces
Your own market
3 tbsp
fish sauce
plus more to adjust
Your own market
1 tsp
dried chilli powder
to adjust heat at the end
Not yet stocked in New York
2 tbsp
neutral oil
Not yet stocked in New York
II
The Method
1
Pound the dried chillies, dried turmeric, salt, garlic, and shallots together in a mortar until a rough paste forms, adding the salt early so it acts as an abrasive and breaks the fibrous chilli skins down faster. Add the kapi and continue pounding until the paste is cohesive and the shrimp paste is fully incorporated. The paste should be uniformly deep gold and pungent — no large fragments of chilli skin remaining.
From the canon — Kapi — fermented shrimp paste — is the foundational umami ingredient of the Thai kitchen. Shrimp Paste (Kapi): Quality, Brands, and Roasting →
2
Soak the tamarind block in 750 ml warm water, working it with your fingers until fully dissolved, so the pulp releases all its sourness into the liquid rather than staying locked in the fibres. Strain through a sieve, discarding the solids. Reserve the tamarind water.
3
Heat the oil in a wok or wide saucepan over medium-high heat. Add the paste and fry, stirring constantly, for 1–2 minutes — this is where the raw edge is driven off and the kapi, which would otherwise dominate the finished broth aggressively, settles into a rounder, toasted fragrance. The paste is ready when the raw garlic smell has gone and that sharper note from the shrimp paste has softened.
4
Pour in the tamarind water and bring to a boil, then season with fish sauce. Add the green beans, cabbage, or eggplant — whichever vegetables are used — before the fish, because they need the full simmer time to become tender without the fish being present to overcook alongside them; simmer for 4–5 minutes. The broth should be visibly acidic and golden, and the vegetables should be tender but not collapsing — test with the point of a knife.
From the canon — Fish sauce — nam pla — is the universal salt of the Thai kitchen. Fish Sauce (Nam Pla): Selection and Use →
5
Add the fish. This is where the dish lives or dies: the fish must go in during the last 10 minutes only, and the heat reduced to a steady simmer immediately, so the flesh cooks through gently and holds its structure rather than flaking apart in the broth. Snapper or grouper should be just opaque to the bone — it will continue cooking in residual heat once off the fire, so pull it a moment before it is entirely done.
6
Taste and adjust. The sourness — corrected with additional tamarind water, never lime, which would give a different and sharper character — must be bold and forward; the heat, adjusted with dried chilli powder, is the cook's decision; fish sauce corrects the salt. The finished broth should read sour-dominant, then hot, then savourily deep. Serve immediately.
From the canon — Dried red chillies, dry-toasted in a pan until their skins blister and darken, produce a qualitatively different flavour from untoasted dried chilli: the Mai… Dried Chilli: Toasting and Grinding →
III
Quality Hierarchy
01
Reserve — Freshly caught platu (short mackerel) from the Gulf of Thailand coast; tamarind pressed from a whole pod the same day; deep-fermented Southern kapi ground in-house; dried bird's eye chillies from that season's crop.
02
Estate — Whole fresh snapper or grouper, broken down to order; good-quality block tamarind extracted fresh; a reliable Southern or Thai-produced kapi.
03
Market — Fresh snapper or grouper steaks from a good fishmonger; block tamarind (not concentrate); any commercially available Thai kapi.
04
House — The minimum viable dish: firm white fish, block tamarind extracted in warm water, standard kapi. Concentrate tamarind and coconut milk are category errors, not substitutions — the dish changes fundamentally.
IV
Sensory Tests
◇Smell. After frying the paste, the sharp raw garlic and aggressive kapi notes resolve into a rounded, toasted, pungent fragrance — the paste is ready.
◇Sight. The broth is a clear, turmeric-gold colour — not cloudy, not white; any cloudiness signals coconut milk, which has no place here.
◇Touch. Vegetables tested with a knife point yield without resistance but do not compress — they are tender, not soft.
◇Sight. The fish flesh is opaque to the bone and holds its shape cleanly when lifted; any visible flaking means it has gone a moment too far.
◇Where it lives or dies. The fish must enter the broth in the last ten minutes only, at a reduced simmer, and be pulled just before it is entirely cooked through — residual heat will finish it, and a moment's over-confidence produces flaking flesh and a dish without structure.
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VI
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