Lao sour soup — fish broth with eggplant, dill, kaffir lime, padaek. Distinct from Thai tom som.
Mekong-tributary villages where padaek (fermented river fish) is the household stock cube and tamarind is the dry-season acid. The dish belongs to a shared Mekong-basin sour-soup tradition spanning Laos and the Thai northeast and central plains, where the two banks long traded and cooked alike.
The Phia Sing royal cookbook (1981, edited by Alan Davidson and Phia Sing's son) records 10 versions of tam som — buffalo-bone, river-eel, with banana flower, with sour-leaf morning glory. Most are now extinct in restaurants but survive in Sayaboury village households.
Pale grey broth, slightly cloudy from padaek, dill stems floating. Sour first (tamarind), salty-funky second (padaek), eggplant softness, fish flake tender — usually river catfish, pla khao. Drunk hot from a bowl, sticky rice on the side.
Padaek is strained, not added whole — the liquor (nam padaek) goes into the pot, the solid fermented fish stays out or the broth turns muddy. Tamarind is steeped in hot water and strained for the same reason. Both acids and salts arrive clear.
Variations
Tam som pa (river fish, Mekong canonical); tam som gai (chicken, Vientiane modern); tam som mak no (with bamboo shoot, rainy-season Champasak); tam som hua mu (pork head, Phongsali Yunnanese-influenced).
On the Palate
Where Tam Som sits in the Lao flavor cloud
Ingredients
Serves 4
How it's made
4 steps · 6 min active + 35 min waiting
- 120 min
Simmer fish bones + lemongrass + galangal + 1 L water 20 min.
Watch outKeep the bone stock at a bare simmer, never a rolling boil — hard bubbles turn it cloudy instead of clean.
- 24 min
Strain; return to pot; add 400 g fish pieces + 1 chopped eggplant + 2 tbsp padaek.
Watch outStir in the padaek liquor only, leaving the solids behind — the murky sediment would cloud the broth.
- 315 min
Simmer 15 min; finish with dill + kaffir lime leaves.
Watch outSimmer just until the fish turns opaque and flakes — push it longer and the pieces fall apart into the broth.
- 42 min
Serve with sticky rice.
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