Sour Curry
แกงส้ม
Gaeng Som is a sharp, sour, water-based curry without coconut milk — made with tamarind or sour fruits, vegetables, and fish or prawns. It has a bracing, tangy flavour unlike any other Thai curry.
Cultural Origin
Gaeng som is a Central and Southern Thai sour curry built on a tamarind-and-chili paste with no coconut milk, producing a thin, fiery, sour-spicy broth. Central versions use tamarind for sourness and often include fish, prawn or kradon (vegetable-marrow) with vegetables. The southern version (gaeng som tai) is hotter, with turmeric and shrimp paste.
Regional Variants
| Region | How it differs |
|---|---|
| Central | Central gaeng som is sour-spicy, tamarind-based, with white fish and vegetables like cauliflower or green papaya. |
| Southern | Southern gaeng som tai is hotter, more sour and tinted yellow with turmeric, often with sea fish or shrimp. |
Allergens & Sensitivities
Key Ingredients
- sour curry paste
- tamarind
- fish or prawns
- vegetables
- fish sauce
Taste profile
- Salty
- fish sauce, soy, shrimp paste
- Sweet
- palm sugar, coconut
- Sour
- lime, tamarind, fermentation
- Umami
- dried shrimp, fermented pastes, stock
No coconut milk means nothing softens the tamarind's sharp edge; the broth is thin and orange-red, and the sourness builds across the meal rather than fading.
How Sour Curry Is Made
- 1
Pounding a simple chilli paste
Dried chilli is pounded with shallot, garlic and shrimp paste into a paste far simpler than a coconut-curry paste, since there is no cream to carry a long list of aromatics.
- 2
Building the sour broth
The paste is dissolved directly into water along with tamarind pulp or juice, which is simmered until the sourness is pronounced — the defining step that separates gaeng som from every coconut curry.
- 3
Cooking the fish or prawns briefly
Fish or prawns go into the simmering sour broth and cook quickly, since overcooking toughens them in the acidic liquid.
- 4
Adding vegetables last
Vegetables such as cauliflower, green papaya or morning glory are added last so they retain bite against the thin, sharp broth.
- 5
Seasoning sparingly
Fish sauce and a little palm sugar are added at the very end, in small amounts, since the dish is meant to stay sour-forward rather than balanced sweet-sour.
When It’s Eaten
A palate-cleansing dish within a shared meal, cutting through richer fried or coconut-heavy dishes on the same table; rarely eaten as a stand-alone meal because of its intensity.
How to Order It
- ขอแกงส้มหนึ่งที่
- kor gaeng som neung thi
- One sour curry, please
- เปรี้ยวมาก
- priao mak
- Very sour
What people get wrong
Expecting a curry in the coconut-curry sense at all — with no cream and a thin, acidic broth, gaeng som has more in common with a sour soup than with green or red curry, and diners expecting richness are often caught off guard.
Where to Try It
Central and southern Thai home cooking; Isan and southern restaurants.
Tips
- The sourness level varies dramatically by region — southern gaeng som is significantly more intense than Bangkok versions.