A bowl of "pho" without a side of chili paste is technically still pho, but something feels off. Vietnamese food is built around condiments — not as an afterthought, but as the final dial that tunes a dish to your exact preference. The problem is that the table in front of you often has five unlabeled jars and no instruction manual.
Here's what each one is, where it comes from, and what it actually belongs on.
Tuong Ot — The Everyday Chili Paste
"Tuong ot" is the catch-all term for chili paste in Vietnamese, but what's in the jar varies a lot. The version most people encounter at noodle shops in Hanoi and Saigon is a smooth, bright-red paste — ground fresh chilies blended with garlic, vinegar, sugar, and salt. Brands like Chin-su are ubiquitous and genuinely good. It has heat, sweetness, and a mild tang that works across a wide range of dishes.
Use it with: pho (쌀국수 / 越南河粉 / フォー), "bun bo hue", "banh mi", fried rice, instant noodles, grilled meats. Basically anything that needs a lift without fundamentally changing character.
In the south, tuong ot tends to be sweeter. In the north, it leans saltier and more pungent. At some Hue restaurants you'll find a coarser, darker version with more dried chili — closer to a sambal — that hits harder on the back of the throat.
Tuong Den — Hoisin's Vietnamese Cousin
"Tuong den" (literally "black sauce") is a thick, dark, fermented soybean paste sweetened with sugar and sometimes blended with garlic. Outside Vietnam (베트남 / 越南 / ベトナム) it often gets labelled hoisin, though the Vietnamese version is generally less sweet and has a deeper, earthier fermented character.
You'll almost always see it paired with tuong ot — the two are spooned together into a small dish and used for dipping fresh spring rolls ("goi cuon") or poured into a bowl of "bun thang". The contrast works: tuong den adds body and umami, tuong ot adds heat and brightness.
Use it with: goi cuon, grilled pork skewers, "banh cuon (반꾸온 / 蒸米卷 / バインクオン)", and as a base dip for steamed or boiled dishes. Don't stir it into a soup broth — it's too thick and heavy.
Mam Tom — Fermented Shrimp Paste
"Mam tom" is the one that clears a room if you're not used to it. It's a smooth, grey-purple fermented shrimp paste with an ammonia-sharp smell that mellows considerably once it's dressed properly — typically loosened with a little lime juice, sugar, chili, and sometimes a drop of cooking alcohol to cut the funk.
Once you've got past the nose, the flavor is extraordinary: intensely savory, briny, and deeply umami in a way that fish sauce alone can't replicate. Northern Vietnamese cooks use it as a core dipping sauce for "bun dau mam tom" — a Hanoi (하노이 / 河内 / ハノイ) platter of fried tofu, fresh rice noodles, and pork served with a generous bowl of the paste. It also appears alongside boiled pork and certain vegetable dishes.
Mam tom is firmly a northern condiment. In Saigon (사이공 / 西贡 / サイゴン) and further south, you'll encounter it but it's not native to the local table. If you're traveling Hanoi and want to eat like a local, lean in — it's worth it.
Use it with: bun dau mam tom, boiled pork belly, steamed or raw vegetables. Not for the faint-hearted at first encounter, but converts are loyal.
Photo by Quang Nguyen Vinh on Pexels
Mam Nem — The Central Coast's Fermented Anchovy Sauce
"Mam nem" is the condiment that defines the center of the country. Made from fermented anchovies — whole fish packed with salt and left to break down over months — it's thinner than mam tom but equally pungent, with a fishier, more complex depth. It's typically served with crushed pineapple and fresh chili stirred in, which cuts through the salt and adds sweetness.
In Hoi An and Da Nang, mam nem is the standard dipping sauce for "banh xeo (반세오 / 越南煎饼 / バインセオ)" (sizzling crepes). It's also what you dip the pork in when eating "cao lau" or "mi quang", and it appears at the table alongside fresh herb platters throughout Quang Nam province.
If you're eating in Hue or Hoi An (호이안 / 会安 / ホイアン) and the table produces a thin, pungent brown sauce with a sour-sweet edge, that's mam nem. Don't confuse it with nuoc cham (the vinegary dipping sauce most international visitors know) — they're built for different dishes.
Use it with: banh xeo, fresh herbs, grilled meats, mi quang (미꽝 / 广南面 / ミークアン). Central Vietnam only, for the most authentic context.
Mam Ruoc — The Southern Fermented Shrimp Paste
"Mam ruoc" is the south's answer to mam tom — similar in concept (fermented shrimp), but made from tiny krill rather than larger shrimp, giving it a lighter pink color and a slightly less aggressive smell. It's used extensively in the Mekong Delta in soups, braises, and stir-fries as a seasoning, and appears as a dipping condiment alongside "bun rieu" and certain hot pots.
The flavor is saltier and less sharp than mam tom — still funky, but with a rounder, almost sweet finish. In Can Tho and the delta provinces, you'll see it on almost every table as naturally as fish sauce appears in the north.
Use it with: bun rieu, hot pot, braised fish, steamed vegetables. Southern and Mekong Delta cooking above all.
Photo by Phương Khánh on Pexels
How to Read the Table
A practical shortcut: region tells you almost everything. If you're in Hanoi, expect mam tom. If you're eating in Hue or Hoi An, expect mam nem. If you're in the Mekong Delta, mam ruoc follows you everywhere. Tuong ot and tuong den are nationwide — the common language of the condiment shelf.
When in doubt, watch what the locals at the next table are doing with a particular sauce before you pour it into your noodles. That's still the most reliable field guide you'll find.
Practical Notes
All five pastes are available in markets across Vietnam — Dong Xuan Market in Hanoi and Ben Thanh Market in Saigon both carry packaged versions good for bringing home. Mam tom and mam nem travel poorly in luggage (customs aside, the smell is unforgiving), so vacuum-sealed packaging is worth the extra cost if you're serious about it.
Last updated · May 26, 2026 · independently researched, never sponsored.
