Mekong flood-season hotpot: tiny migratory ca linh fish dropped into a tamarind-sour broth bright with sesbania (bong dien dien) flowers, water-spinach (morning glory) stalks — eaten over rice or rice noodles.
Lau Ca Linh exists only during the Mekong's annual flood, roughly September to November, when ca linh fish migrate downriver in shoals from Tonle Sap (Cambodia) into the Vietnamese delta provinces of An Giang and Dong Thap. The same season delivers sesbania flowers, so the dish is a strict pairing of two flood-only ingredients. Locals call this period «mua nuoc noi» (rising-water season), and the hotpot is its emblematic dish — eaten weekly while in season, absent the rest of the year.
A flood-season-only dish — September to November, when ca linh fish migrate downriver from Tonle Sap into An Giang and Dong Thap. Same season delivers so dua flowers. The pairing is locked to those two months; the rest of the year it doesn't exist.
Broth bright orange-brown from tamarind, the sourness sharp on the front of the tongue, then a savoury-sweet finish from fish sauce and tomato. Ca linh are eaten whole — bones soft from the brief cook, flesh sweet and faintly muddy in the way river fish should be. Bong dien dien flowers, the load-bearing visual: pale yellow, like tiny edible orchids, with a faint nutty crunch and a green-bean note. The water-spinach stalks stay snappy. A weak version is sour without depth, or grey because the greens were boiled too long.
The cooking time discipline is the load-bearing detail. Ca linh are tiny — 5cm — and need only 90 seconds; longer and the flesh disintegrates into the broth. So dua flowers go in for under a minute, like delicate herbs, not vegetables. Tamarind, not lime, is the souring agent because it brings a deeper, almost prune-like sweetness alongside the acid; lime is added only to adjust at the end. The broth itself is intentionally lean — pork stock or even just water — so the fish-and-flower season speaks.
Variations
Lau ca linh bong dien dien is the standard An Giang version; Dong Thap stalls add water-mimosa stems for extra crunch; lau mam from the same delta swaps in fermented-fish broth as a year-round substitute when ca linh are out of season; Chau Doc kitchens lean heavier on tamarind.
On the Palate
Where Lau Ca Linh sits in the Vietnamese flavor cloud
Ingredients
Serves 4
How it's made
6 steps · 40 min active + 20 min waiting
- 117 min
Soak 60g seedless tamarind pulp in 200ml hot water 15 minutes; mash, strain, keep the brown liquid. Discard fibres.
- 25 min
Heat 2 tbsp oil in a clay pot or wide hotpot. Sweat 2 sliced shallots and 3 cloves garlic 1 minute. Add 2 chopped tomatoes; cook until breaking down, 4 minutes.
- 310 min
Add 1.5L unsalted pork stock or water, the tamarind liquid, 3 tbsp nuoc mam (fish sauce), 1 tbsp sugar, 2 sliced bird's-eye chilies. Simmer 10 minutes — the broth should taste sharply sour with a sweet-salty floor.
Watch outSimmer the broth until it tastes sharply sour over a sweet-salty base — set the balance now, because the fish and flowers barely touch it after.
- 44 min
Clean 600g ca linh (Mekong river fish, ~5cm long) — gut by squeezing, trim fins, rinse. If unavailable, substitute small smelt or anchovy. Bring broth to a rolling boil; tip in fish; cook 90 seconds — they are cooked when the eyes turn opaque.
Watch outTip the tiny fish into a hard rolling boil for just 90 seconds — they're done the instant the eyes turn opaque; any longer and they fall apart into the broth.
- 52 min
Reduce heat. Add 200g sesbania (so dua) flowers, 200g water-spinach stalks split lengthwise, 100g morning glory leaves last — 60 seconds, no more, or they go olive-grey. Taste: more lime juice if not sour enough.
Watch outDrop the flowers and greens in for 60 seconds and no more — pull them while still bright; overcooked they slump to a dull olive-grey.
- 62 min
Bring the pot to the table on a flame. Eat by ladling broth, fish and greens over hot rice or fresh rice vermicelli; dip fish in nuoc mam with sliced chili.
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