Bún mắm Sài Gòn is a generous southern Vietnamese noodle soup built around a savory broth made from fermented freshwater fish. This home version simmers cá linh and cá sặc pastes, strains out the solids, then blends the liquid with unsalted pork stock, lemongrass and aromatics. Thick rice vermicelli is topped with snakehead fish, shrimp, squid, roast pork, fish cake and tender eggplant. A platter of fresh greens, lime and chilli lets everyone finish the bowl to taste.
Restaurant bowls differ: cooks may choose other fermented fish, seafood, pork cuts, fish cakes and local greens. Sài Gòn reporting describes broth seasoned to keep the characteristic mắm aroma without making it overwhelmingly pungent, salty, sweet or hot. This measured recipe follows that idea as a practical home version, not a definitive formula.
Boil and strain the fish pastes. Put the cá linh and cá sặc pastes in a saucepan with 1,200 ml water and 1 bruised lemongrass stalk. Bring to a full boil, then simmer steadily for 15 minutes, stirring to break up the paste. Do not taste it before boiling. Strain through a clean fine-mesh sieve lined with cheesecloth. Discard the solids and keep the liquid.
Sauté the aromatics. Warm the neutral oil in the stockpot. Add the shallot and garlic and cook until fragrant but not browned. Add the 2 remaining bruised lemongrass stalks.
Build and season the broth. Pour in the strained fish liquid, pork stock, 800 ml water and sugar. Simmer gently for 20 minutes. Taste only after the broth has boiled; fermented pastes differ in saltiness. Add up to 4 g salt only if needed, or leave it out.
Cook the eggplant. Add the eggplant and simmer for 10–12 minutes, until tender but still holding its shape. Keep the broth at a gentle simmer.
Cook the noodles. Prepare the rice vermicelli according to the package directions. Drain well and divide among four deep bowls.
Prepare the greens. Wash and drain the bean sprouts, water spinach stems, banana blossom, rau răm and Thai basil. Arrange them on a separate platter with the lime wedges and optional chilli.
Poach the fish. Bring the broth back to a gentle boil. Add the fish portions in batches and cook until opaque and at least 63°C in the thickest part, measured with a clean food thermometer.
Cook the shrimp and squid. Add the shrimp and squid in batches. Cook until firm and opaque, checking thick pieces reach 63°C. Avoid prolonged boiling, which can make them tough. Use clean utensils for the cooked seafood.
Warm the prepared toppings. Add the roast pork and fish cake to the hot broth until steaming throughout. If reheating chilled prepared toppings, check that they reach 74°C. Remove the lemongrass stalks. Divide the eggplant, fish, shrimp, squid, pork and fish cake among the noodle bowls.
Ladle and serve. Pour hot broth into each bowl and serve straight away with the greens, lime and optional chilli. Refrigerate perishable leftovers within 2 hours at or below 4°C; use within 3 days and reheat leftovers to 74°C.
The aroma of fermented fish is strong by design. Simmer the pastes with the window or extractor fan on, and strain them well for a smoother broth. Buy fermented cá linh and cá sặc pastes from a refrigerated Vietnamese or Southeast Asian grocery. Check the label and keep them chilled after opening. Use unsalted pork stock so the fermented pastes remain the main seasoning. If only salted stock is available, omit the optional salt and taste after the broth simmers. Fresh banana blossom and water spinach stems may be hard to find. Serve the available greens from the list, keeping them separate and crisp. Cook the seafood shortly before serving. Long simmering makes shrimp and squid firm and can break delicate fish into the broth.
The broth tastes too salty: Add a little hot water or unsalted stock, then taste again. Do not add more fish sauce or salt. The fish-paste broth has fine solids: Strain it again through clean cheesecloth. Do not press the solids through the sieve. The seafood is rubbery: It was cooked too long or at a hard boil. Poach the next batch gently and remove it as soon as it is opaque and reaches 63°C. The bowl tastes too intense: Add more hot broth or noodles and serve extra lime and greens on the side; keep the fermented-fish character rather than masking it with lots of sugar.
Can I use just one kind of fermented fish paste? The measured version balances cá linh and cá sặc pastes. Using only one changes the flavour and saltiness, so taste carefully and do not add the optional salt until the broth is finished. Can I leave out the roast pork or fish cake? Yes, but the bowl will differ from this Sài Gòn-style serving. Keep the remaining portions of fish, shrimp and squid the same and add more eggplant or greens if you want a fuller bowl. Can I make the broth ahead? Yes. Cool it promptly, refrigerate it in a covered container and use it within 3 days. Reheat the broth to a boil, cook the seafood fresh, and reheat chilled pork or fish cake to 74°C.
Contains fish, crustaceans (shrimp) and molluscs (squid). Fish cake and prepared roast pork may contain additional allergens or cross-contact; check their labels. Keep raw seafood at or below 4°C and separate from cooked noodles, prepared toppings and ready-to-eat greens. Bring the fermented-fish paste mixture to a full boil before straining; do not taste it raw. Cook fish, shrimp and squid to at least 63°C, measured at the thickest point with a clean thermometer. Keep cooked and raw utensils separate. Store prepared roast pork and fish cake according to their labels; heat chilled prepared toppings to 74°C when reheating. Refrigerate broth, noodles and toppings in shallow covered containers within 2 hours at or below 4°C; use within 3 days and reheat leftovers to 74°C.
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