Mekong fermented-fish hotpot built on mam ca linh and mam ca sac broth, with assorted fish, eggplant, water mimosa, banana flower, water spinach, and herbs.
Lau mam is the Mekong Delta's hotpot, especially associated with Chau Doc (An Giang province) and the Khmer-Vietnamese border kitchens. Mam — fermented salted fish — is a Mekong staple invented to preserve the annual fish glut from the flood season. The dish is communal by design: a single pot at the table, vegetables and proteins in mountains around it, eaten over 2-3 hours. The funk is intense enough that lau mam is often a love-it-or-leave-it dish even within Vietnam — northerners and many urban southerners find it strong; Mekong locals and the diaspora call it the dish they miss most.
Chau Doc (An Giang) hotpot built on fermented mam — the funkiest broth in Vietnamese cooking. Mam ca linh as mellow base, mam ca sac as sharp top; using only one flattens it. 20-minute simmer minimum to break down bones.
The broth is the loudest broth in Vietnamese cooking — funky, deeply savoury, with a fish-fermentation pungency closer to anchovy paste than soy. Mam ca linh provides depth; mam ca sac brings sharper top-notes. Lemongrass and annatto round and colour it. The vegetables matter as much as the protein: water mimosa keeps a watery crunch even after a minute in the pot, banana flower brings astringency, water spinach goes silky. A spoonful of broth straight: heavy, salt-sweet, almost meaty. Eaten with bun, dipped in chilli-lime, the funk lifts.
Mam dissolution is the load-bearing step: the fermented fish must be simmered long enough (20+ minutes) to break down bones and skin into the liquid; otherwise the broth tastes raw-fishy rather than deeply savoury. Straining is essential — bone fragments are dangerous in a communal pot. The two mam types are paired on purpose: mam ca linh is mellow base, mam ca sac is the sharper top — using only one gives a flatter result. Pork belly or coconut water is added for sweetness/roundness; without it, the broth is one-dimensionally salty.
Variations
Chau Doc is the canonical version; Soc Trang Khmer-influenced cooks add prahok and lean heavier on prahok-bouilli funk; urban Saigon restaurants strain twice and dial down the mam for non-Mekong palates.
On the Palate
Where Lau Mam sits in the Vietnamese flavor cloud
Ingredients
Serves 6
How it's made
6 steps · 45 min active + 30 min waiting
- 125 min
Simmer 200g mam ca linh and 100g mam ca sac (fermented Mekong fish) in 1.5L water for 25 minutes. The fish softens and dissolves; the liquid becomes brown and pungent. Strain through a fine mesh, pressing on the solids — discard the bones and skin.
Watch outSimmer the mam a full 25 minutes until the fish falls apart and the broth smells deep-savoury rather than raw-fishy, then strain hard so no bone shards can reach the pot.
- 212 min
In a wide hotpot, sauté 4 cloves minced garlic, 4 minced shallots, 2 stalks bruised lemongrass, and 1 tsp annatto oil over medium heat for 2 minutes. Add the strained mam liquid plus 800ml pork or coconut water, 2 tbsp sugar, 2 tbsp fish sauce. Simmer 10 minutes.
- 38 min
Cut 200g pork belly into 1cm slices and add to the broth. Simmer 8 minutes until just tender.
- 48 min
Arrange a platter for the table: 300g snakehead fillet sliced 5mm thick, 200g shrimp peeled, 200g squid scored and cut, 200g basa or catfish chunks. Keep cold until serving.
- 510 min
Arrange a vegetable platter: 200g Asian eggplant in 2cm rounds, 200g water mimosa (rau nhut) in 5cm lengths, 1 banana flower thinly shredded and held in lemon water, 300g water spinach (rau muong) in 6cm lengths, fistfuls of rau om, ngo gai, perilla, mint.
- 62 min
Bring the hotpot to the table on a portable burner. Diners drop fish, shrimp, squid, eggplant, and the firmer greens into the simmering broth; cook 1-2 minutes; lift out and eat with rice vermicelli, fresh herbs, and chilli-lime dipping sauce. Add greens and herbs in waves throughout the meal.
Watch outFish, shrimp and squid need only 1 to 2 minutes in the broth — lift them the instant they turn opaque or they go tough.
