Khao Poon: Laos's Fermented-Fish-Scented Rice Noodle Curry

Before the noodles go into the fragrant broth, the vegetables go on the table

A green scent rises from the board where lemongrass has been bruised, and red powder is left in the mortar where dried chiles were crushed. In the pot, coconut milk shifts slowly, and a broth layering chicken stock and fish sauce seeps into the narrow gaps between rice noodles. Beside the bowl sit shredded cabbage, bean sprouts, mint and lime, each on its own.

This is khao poon (ເຂົ້າປຸ້ນ). A broth of chicken, fish or pork is combined with an aromatic paste and fish sauce and poured over thin rice noodles. The red coconut-milk broth is rich, but because the noodles and vegetables are not simmered in the same pot, you can control how heavy each mouthful feels.

The key is to finish the broth first, then boil the noodles, and add the vegetables at the table. Noodles simmered in the broth absorb liquid, taste saltier and lose the snap of thin noodles. Bringing hot broth, springy noodles and cool vegetables together in one bowl lets you move the heat and the fish-sauce aroma at your own pace.

This recipe does not reproduce the traditional Lao broths made with fish or pork bones. It uses chicken thigh, easy to handle in any home kitchen, and keeps the roundness of coconut milk and the fermented depth of fish sauce, in the style of chicken khao poon nam gai. If you can find galangal, it can replace part of the ginger, but the amounts are set so the dish holds together on days you can't find the aromatic root.

At the Lao table, room to choose comes before the broth

Pha Khao Lao's food materials present khao poon as one of Laos's signature dishes, with a broth of fish, pork bones or chicken carcass, lemongrass, garlic, onion, galangal, and padaek or fish sauce. They say it can be made with fresh khao poon noodles, but also with dried noodles or rice noodles, and that cabbage, bamboo shoots, bean sprouts, mint, long beans and lime are not put in the pot but set on the table for each person to add.

WFP Asia & Pacific, meanwhile, features a recipe by Lao nutritionist Khan for a meatless khao poon using yellow split peas, mushrooms, taro and pumpkin. Raw cabbage, long beans, morning glory, banana blossom and bean sprouts come alongside like condiments, and a paste of coconut milk and chile is stirred into the broth. Whether meat is used or not, the shared idea is that the hot broth does not finish the flavor alone; green vegetables and herbs are layered on at the end.

Some accounts describe khao poon as a dish prepared for family celebrations. WFP's article covers it as a dish made for family celebrations in Laos and shows rice noodles, broth and vegetables being added to the bowl in turn. A Lao cooking class in Seattle also introduces khao poon as a dish for family gatherings and Buddhist temple events. It is less an everyday quick noodle than a dish that shines when one person crushes aromatics, another handles the noodles and another cuts vegetables in the same kitchen.

In Laos, rice is tied not only to daily eating but also to festivals and religious ceremonies. The Lao national news agency's introduction to a rice festival likewise records rice as a foundation of life and ritual handed down over generations. The thin rice noodles of khao poon are not just something to carry the broth; they are the center of the table, absorbing the heat of the broth, the saltiness of fish sauce and the moisture of the vegetables.

Cooked outside Laos with dried rice noodles, boiling them first and rinsing in water may feel a little removed. Fresh noodles in Laos change in softness and moisture along with the broth. Dried noodles make up for this if you stop them slightly firm and start eating right after pouring the broth, which keeps the snap of the thin noodles.

There is no single right answer, so decide on the broth first

Khao poon is often summed up as "Lao curry noodles," but the thickness of the broth and the toppings vary by home and region. The traditional northern Lao version described by Pha Khao Lao uses fish and pork bones or chicken carcass, and it explains that coconut milk is not added in the north. It is a broth rich in ingredients: flaked fish, pork, and seasoning from padaek or fish sauce.

The chicken version with coconut is often seen in Lao-style cooking classes and home-cooking explanations. Chicken is combined with an aromatic paste and turned into a red broth with coconut milk, fish sauce and makrut lime leaves. It is sometimes introduced as a rice noodle dish close to Thailand's khanom jeen nam ya, but the two are not the same. Khao poon comes with Laos's fermented seasonings, herbs, and the practice of serving vegetables separately.

Fish sauce and padaek are better not treated as the same thing. The Thailand Foundation explains that the fermented fish known in northeastern Thailand as pla ra, and in some regions as pla dek, is a seasoning made by fermenting freshwater fish for a long time with salt and rice bran, with a strong aroma and saltiness. Laos's padaek has a similar fermentation culture, but strength and solids differ from product to product. For a first attempt, using fish sauce, which is liquid and easy to measure, makes mistakes easier to correct; only those who want more aroma should try a little padaek.

Whether you put strong fermented aroma at the center or bring forward the roundness of chicken stock and coconut changes the impression of the same khao poon a great deal. Rather than deciding on one restaurant taste, choose how the broth is built first, then buy ingredients, and you won't be left with seasonings you don't need.

Outside Laos, put the aromatic base ahead of the noodles

Chicken thigh, cabbage, bean sprouts and cucumber, easy to find in ordinary supermarkets, serve well as the foundation. The difference in flavor comes from the order in which the aromatics are made into a paste and from not adding too much fish sauce at once. Crushing chiles, garlic, onion, ginger and lemongrass finely spreads their fragrance through the broth more than merely chopping them does.

For lemongrass, make the soft base into paste and use the rest in the stock pot. Makrut lime leaves added at the start make the aroma too rounded, so add them near the end once the broth is settled. Remove the hard central rib and tear large leaves to a size diners can set aside.

Galangal, which appears in authentic ingredient lists, is not the same plant as ginger even though both are rhizomes. Galangal smells closer to dried citrus and white pepper than ginger does. If you find it frozen, replacing 10 g of the 20 g ginger with 10 g galangal moves the aroma in that direction. Even if you use ginger alone, the order of chicken stock, fish sauce, lemongrass and makrut lime leaves remains, so the dish doesn't stray far from its name.

Boil dried rice noodles in a separate pot rather than rehydrating them in the broth. If the package says 5 minutes, taste at 4 and a half, and when the hard core has just disappeared, drain into cold water. Because hot broth will be poured over them, noodles boiled until fully soft break easily in the bowl.

You can replace fish sauce with light soy sauce. But soy sauce adds saltiness without the aroma of fermented fish. Treat it as a substitute for when you need to avoid fish, and make up for the lack of depth with mushrooms or roasted onion.

Ingredients (serves 4)

The broth is made a little strong so that it is just right once noodles and vegetables go into the bowl. Boneless chicken thigh is easy to shred after simmering; if you use breast, take it out of the pot as soon as it is cooked through.

Use whichever chicken and rice noodles you can buy nearby. Makrut lime leaves, lemongrass and fish sauce are easiest to use up if you cook Southeast Asian food regularly. For frozen items, choose ones where you can take out only what you need rather than using all at once.

When shopping, the aromatic core and how it is crushed make the difference

Coconut milk and dried rice noodles are relatively easy to find on import shelves, so there is no need to buy extra from the start. What directly affects taste is the aroma of the fish sauce, how well frozen makrut lime leaves keep, and tools that crush aromatics finely.

If you will use fish sauce only once, you can make this with light soy sauce and salt. If you will use its aroma in khao poon, stir-fries and glass noodle salads, a larger bottle makes sense. If you need to avoid seafood, check the type of fish and any additives on the label.

Frozen makrut lime leaves let you take out only what you need and save the rest for other dishes. Leaf size and count vary by product, so check that they are frozen and the quantity. What is left after the 3 leaves used here can go into tom kha gai or green curry. If you will cook this only once, a little lemon zest as a substitute saves shopping.

A mortar is not essential. You can crush the aromatics by chopping them finely and pressing with the flat of the knife on a board. If you often make Lao or Thai pastes, salsas or spice mixes, a heavy granite mortar stays put on the counter and makes it easier to crush dried chiles and onion separately. If you have no place to store one, skip it.

Method

Measure all the ingredients and thinly slice only the 8 cm base of the lemongrass for the aromatic paste. Wash the knife and board used for chicken with detergent before cutting vegetables. While the broth simmers, prepare the noodles and table vegetables so the noodles don't wait too long at serving.

When the broth goes wrong, restore temperature and moisture before adding flavor

Because fish sauce, coconut milk and chile go into the same pot, it is tempting to correct a strong taste with sugar alone. Sugar rounds the corners of saltiness, but it cannot fix a lack of liquid or burnt aromatics. Look at the state of the pot and separate what can be restored from what must be remade.

If dried rice noodles have gone into the broth, it is hard to move the broth to another pot and take out only the noodles. If the noodles are still firm, add a little stock, warm over low heat, plate and eat right away. Noodles that have absorbed all the liquid over time are better replaced with freshly boiled noodles than rescued by adjusting the broth.

When adding fish sauce, don't pour it by the tablespoon into the whole pot; scoop a little broth into a bowl, mix in 1 tsp and taste. Decide the amount to return to the pot first, then adjust the whole, and each diner can also choose their own strength.

With a plate of vegetables, the same broth tastes different in every bowl

Rather than plating khao poon completely as an individual finished dish, putting noodles and broth in the bowl and herbs and vegetables beside it conveys the character of the dish. Taking more cabbage thins the heat of the broth, adding mint makes the fish-sauce aroma feel lighter. Lime is not only sourness but also cuts the aftertaste of chile.

You can change what you add depending on whether you want to move toward a Lao broth or make it easier to eat as a regular dinner.

When using a fermented fish seasoning like padaek, check the heating instructions and ingredients of the seller and warm it thoroughly in the pot. Avoid substituting a home-fermented raw fish product in the same amount. If you have a shellfish or fish allergy, check not only fish sauce but also padaek, fish-based stock and each product's labeling.

For storage, keep broth and noodles apart and cut the vegetables on the day you eat

Move leftover broth to a shallow container once it has cooled slightly and refrigerate it apart from the noodles. English-language khao poon recipes also describe keeping broth and noodles separate in the refrigerator and eating within about 3 days. Noodles left soaking in the broth absorb liquid and break easily, so keep vegetables and herbs separate as well.

To reheat, put only the broth in a pot and warm over medium-low heat until it is hot all the way through. To freeze, seal only the broth, thaw it in the refrigerator, then warm it. Coconut milk tends to separate when reheated, so don't boil it, and mix in a little stock or hot water to restore the strength. If the look or smell seems off, do not eat it regardless of how many days it has been stored.

Frequently asked questions

Q. Is it not khao poon without padaek?

It is not essential. Padaek is a seasoning with a strong fermented fish aroma and saltiness, so it is easier to handle by making it with fish sauce the first time and trying a little next time if the aroma seems lacking. If you will use no fish sauce either, switch to light soy sauce and make up the umami with mushrooms or roasted onion.

Q. Can I substitute ginger for galangal?

You can, but the aroma will not be the same. Ginger is a warm pungent spice, while galangal smells closer to dried citrus and white pepper. Check the steps with ginger the first time, then try 10 g of frozen galangal next time to compare the difference.

Q. What do I do with fresh khao poon noodles?

Handle fresh noodles according to the package or the seller's guidance, and don't boil them as long as dried ones. The khao poon noodles described by the Seattle Lao cooking class are also thin round noodles prepared separately from the broth. Fresh rice noodles vary a lot by product, so after blanching, taste one and stop when there is no core and they don't break.

Q. Can I make this without a mortar?

Yes. Finely chop the chiles, garlic, onion, ginger and lemongrass with a knife and press them with the flat of the blade. Pieces tend to stay larger than with a mortar, so extend the frying time by 1–2 minutes and check that the raw onion smell has gone.

Q. How far ahead can I make it?

Making the broth the day before and preparing noodles and vegetables on the day you eat works well. When it cools, the coconut fat sets and the surface turns white, but gentle warming restores it. Noodles put into the broth the day before absorb liquid, so don't combine them in one container.

Lao dishes to cook alongside

If you like the combination of herbs and rice noodles in khao poon, Khao Piak Sen, a hand-cut noodle that thickens its broth, shows how the same rice-based noodle changes in texture design. Laab, which brings minced meat and herbs together with lime, is a dish with no broth that is served with raw vegetables. To compare with Thai rice noodles, look at how chiles, fermented seasonings and vegetables are placed in Khanom Jeen Nam Ya, eaten with a fish broth.

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