New here? This is the eighth article in our Banchan Deep Dive series: one Korean side dish per article. If Korean restaurants are new to you, start with Part 1 and Part 2 of the Survival Guide, then the rules for eating banchan. Last time we covered eomuk, the fish cake your dictionary describes as a potato patty. Today's dish is one you have very likely eaten and almost certainly cannot name.
Recipes vary by restaurant and household. When it matters, ask.
Ethan Miller, thirteen, sat at a Korean table in Ohio for a whole evening and asked nothing.
Not about the fire. Not about the small dishes. He had said one word at the door and it was hi.
He ate the entire time.
The record of that night has one line about him and the boy across the table, the one who had beaten him in three games the week before. Both still eating. Both listening in that thirteen-year-old way where you pretend you are not.
Then the dishes went back to the kitchen and somebody washed them.
Nobody wrote down what had been in them.
That is the normal outcome, and it is the reason this series exists. Six or eight small plates arrive at a Korean table. They get eaten. Afterward almost nobody can name more than two. Kimchi, and something.
The something is very often a vegetable that was cooked, wrung out, and then dressed cold. There are dozens of them. One of them is made of mushrooms, and it is the one this article is about.
It is beoseot-muchim (버섯무침), and the first useful thing to know is that English has no name for it. Neither does the Korean government's official list of English names for Korean food, which is the stranger fact of the two.
What is mushroom banchan?
Mushroom banchan is beoseot-muchim (버섯무침), a Korean side dish of mushrooms that have been cooked, wrung out and then dressed cold. Oyster mushrooms are the default. The seasoning is usually salt or soy sauce with sesame or perilla oil, garlic and toasted seed, and the mushrooms are torn along the grain rather than sliced. It arrives at the table without being ordered, in a small dish, at room temperature.
Is Korean mushroom banchan spicy?
Usually not. In a set of 131 Korean photographs of this dish, only about one in six had any chili in it at all, and the largest group by a wide margin was plain: salt or a little soy sauce, sesame oil, toasted seed. A red version exists and is completely ordinary. It is simply not the default, and the heat in it is bright and shallow rather than deep.
Is mushroom banchan vegan?
Often, but do not assume it. The mushrooms are never the problem. The liquid seasoning is. One standard version is salt, sesame oil, garlic and perilla seed and nothing else, which is vegan. Others carry tuna extract, anchovy sauce or oyster sauce, and the enoki version is frequently mixed with imitation crab. Ask about the sauce specifically, because a server asked about mushrooms will think about mushrooms.
Which mushrooms are used in Korean mushroom side dishes?
Five, and they do not behave alike. Oyster mushroom is the default and the most farmed in Korea. King oyster, which Korean menus call saesongi, is second. Then wood ear, which turns up in a cold vinegar plate that looks like a different dish entirely, shiitake, which is more often braised dark in soy sauce than dressed, and enoki, which is usually served cold with vegetables and imitation crab.
What does Korean mushroom banchan taste like?
Mild, salty and nutty, with texture doing most of the work. The mushrooms are torn along the grain and squeezed dry before anything is added, so they are chewy rather than wet, and they hold seasoning instead of shedding it. The nutty note is sesame oil, or perilla seed powder, which is the single most searched partner for this dish in Korea and turns it creamy and grey instead of glossy.
What is Mushroom Banchan?
Beoseot-muchim is mushrooms, cooked, wrung out, and dressed cold in a bowl. That is the whole object. No sauce underneath, nothing on top that was not stirred through it first.
It belongs to a family. A namul is a vegetable or a wild green seasoned into a side dish, and Korean encyclopedias put mushrooms in the ingredient list beside every vegetable and the new shoots of trees. You have met two of the family already: spinach and soybean sprouts, both cooked first, both dressed after.
The mushroom version is on the cooked side of that family. Every method that turns up does the same thing first. Boil for a minute. Or set them in a dry pan and let their own water carry the heat. Or put them in a microwave, which several Korean cooks recommend without embarrassment.
Not one of 131 Korean photographs of this dish showed a raw mushroom.
Then comes the step that makes the dish work, and it is an act rather than an ingredient.
You squeeze the water out.
Mushrooms give up an enormous amount of liquid when they are heated. Leave it in and the seasoning slides off, pools at the bottom of the dish, and what reaches you tastes of nothing.
Every source consulted deals with this. The American recipe says to firmly squeeze out any excess water. The Korean home recipe says to rinse in cold water and wring it.
The one that skips blanching uses a dry pan for the same reason. The mushroom's own moisture cooks it, and what you get back is chewier.
Three things are constant across every version. The mushrooms are torn along the grain rather than cut. The water comes out. Sesame oil or perilla oil goes in.
Everything else is negotiable, and that turns out to matter more than it sounds.
The texture is the point, and you will feel it before you work out why. A mushroom that has been wrung out stops being spongy and starts being springy, in long strands that pull apart the way they grew. That is why they are torn and not sliced. A knife cuts across the grain and loses you the one structural thing the ingredient has.
Not a Stir-Fry, Except When It Is
Here is the fact this article was built on.
Korea maintains an official list of standard English names for its dishes, 778 of them, produced by the national food promotion institute with the National Institute of Korean Language. Search it for mushrooms and you get stir-fried oyster mushrooms, stir-fried golden oak mushrooms, mushroom and perilla seed stew, mushroom hot pot, mushroom porridge.
There is no entry for beoseot-muchim.
There is no entry for beoseot-namul either. The only mushroom side dish the Korean government has given an English name to is the fried one.
The English-language internet reached the same place on its own.
The most authoritative Western recipe you will find for this ingredient is Milk Street's, titled Korean Stir-Fried Mushrooms. Its opening line tells American readers that a Korean meal typically features several banchan, and that stir-fried or sautéed mushrooms, called buh-sut bokkeum, are a common one.
No blanching step. No perilla. The word in that sentence is bokkeum, which means fried.
Now look at what Korean home cooks title their own posts about this dish.
Do not stir-fry it, dress it.
Try dressing your mushrooms instead of frying them.
Do not stir-fry the king oysters, put them in the microwave.
Those are real titles from the top results, and they are all built the same way. This dish introduces itself by naming the thing it is not.
Which is a strange way for a food to behave, and it makes sense only once you notice that the thing it is not is the version with the official English name.
Be fair to the other side, because the line is genuinely blurry.
The best known English recipe for dressed oyster mushrooms is filed under bokkeum by its own author, and it runs: blanch one minute, drain, wash gently, squeeze the water out firmly, add garlic and salt and sesame oil and pepper, mix well with a wooden spoon, then stir-fry for one to two minutes.
She knows it is unusual and says so, calling out the blanching plus quick frying as what makes it distinctive.
Count the steps. The whole dressing procedure happens first. The pan gets ninety seconds at the end.
So these two dishes overlap and the boundary moves. What does not move is which side of it Korea's home cooks think they are on, and they put it in the title so nobody gets it wrong.
The same list does one more thing, and if you have read this series before you have met it. It translates muchim, every time, as Salad. Bean sprout salad. Laver salad. Oyster salad. Yellow cucumber salad.
That equation was not invented by a recipe blogger. It is printed by the state, and it is the one oi-muchim was written to break.
It fails here for the reason it failed there. A salad is raw things with dressing on them. This is a cooked thing that has been wrung out.
Try looking any of it up yourself. Beoseot-muchim has no English Wikipedia article. Neither does oi-muchim, kongnamul-muchim or sigeumchi-namul, and muchim itself redirects to namul. Every banchan this series has covered is missing from the English encyclopedia, which is not a reason to skip one.
Five Mushrooms, Five Dishes
Beoseot-muchim is not a dish. It is an umbrella over five of them, and the differences are not small.
Oyster mushroom is the default, and it is what you will get. It shows up in 37 percent of Korean photographs of the dish, which is very close to the 38 percent of Korea's mushroom crop that oyster mushrooms represent. Farm output and search results agree almost exactly.
When a Korean recipe says beoseot with no adjective, this is the mushroom it means. Soft, layered, easy to tear into strands.
King oyster is second, and its Korean name is wrong. Korean menus call it saesongi, which reads as new pine mushroom, and it is not a pine mushroom. It is a large oyster mushroom.
Korea's Rural Development Administration says so in a footnote to its own press release. The name was attached when the mushroom arrived as a substitute for the expensive wild one, it stuck, and the correct scientific name is the large oyster.
The English name, king oyster mushroom, gets it right.
That is a first for this blog. Usually the Korean name is precise and the English one is a guess. Here it is the other way around.
King oyster is thick, cut into rounds or torn into fat strips, and it is the one you are most likely to meet red, because the coarse texture holds a chili dressing that would slide off anything softer.
Wood ear is a different meal wearing the same name. Black, rubbery, translucent at the edges, mixed with red and yellow pepper strips and cucumber, dressed with vinegar and mustard, served cold. It is 13 percent of the photographs and looks nothing like the other 87 percent.
If you get handed this one while you were expecting the pale one, nothing has gone wrong. You have a different dish in front of you.
Shiitake mostly goes somewhere else. Dressed, it is one of the darker versions. But the usual fate of a Korean shiitake is a long simmer in soy sauce until it is almost black and glossy, which is a braise and not a muchim.
Worth knowing, if you have seen the famous one: the best known Korean mushroom cook in the West does not make this dish.
A Seon Buddhist nun whose temple cooking reached Western audiences through a Netflix series has said that braised shiitake became her signature dish, and that she and the others wash and cook so many of them a day that her hands still smell.
At a dinner she cooked for an American university, the braised shiitake was the centerpiece and the oyster mushrooms went into the bowl.
Two mushrooms, two jobs, one table. Neither of them dressed cold.
Enoki is the outlier and you should treat it as one. The pale threads sold in a vacuum pack are blanched briefly and mixed with chives, bean sprouts, crown daisy and imitation crab in a mustard dressing, cold.
Look at what Koreans search alongside it and you get a completely different list from the other four. The top companions for enoki are crab stick and mustard. The top companion for every other version is perilla.
Different seasoning, different temperature, different ancestry. Same word on the label.
💡 Perilla, not sesame
Ask Korea's largest search engine about this dish and the first related term it hands back is not a mushroom. It is deulkkae, perilla seed. It appears in the related terms for all six mushroom queries measured, it was in the title of 30 of 131 posts, and it is the second largest group of photographs after plain. The seed is ground to a pale powder and stirred through at the end, where it thickens the dressing until the dish goes matte grey, and adds a nutty weight sesame does not have. Perilla is not a kind of sesame. It is a mint relative, botanically unrelated, and whether the two cross-react is a question this research did not answer. If sesame is a medical issue for you, treat perilla as an unknown rather than a substitute.
💡 The one mushroom with a rule attached
The United States Food and Drug Administration holds an import alert on fresh enoki mushrooms from Korea and China, letting it detain shipments without testing them. The reason is listeria. Over three fiscal years ending in 2023 the agency sampled imported enoki and found 43% of the Korean product and 15% of the Chinese product contaminated. A linked outbreak covered 36 people across 17 American states, 31 of them hospitalized, with four deaths, and 27 enoki recalls followed in about three and a half years. This applies to one mushroom and not to the other four, and it matters here for one reason: the enoki version of this dish is served cold, and listeria grows at refrigerator temperature. The advice to cook enoki through rather than blanch it lightly is the agency's, not this blog's.
One last thing, in case you have been picturing baskets and forests. All five are farmed. Korea has something like 1,900 wild mushroom species and only about 400 edible ones, which is the ratio behind the national advice every autumn to stay with the cultivated kinds. Nothing in this dish was foraged.
Ordering It and Eating It
You will not order this, and that is the whole arrangement. Mushroom banchan is not on the menu. It arrives with everything else that arrives in small dishes, it is included, and it gets refilled if you finish it.
Why any of that happens has its own article and is not re-argued here. What matters at your table is that you can neither request this dish nor decline it. The only useful skill is recognizing it when it lands.
Look for pale strands in a mound, torn rather than sliced, sitting dry rather than in liquid. Scallion or carrot for color. Toasted seed on top. If it is grey and matte instead of glossy, that is the perilla.
Ask about the liquid, not the mushroom. Mushroom banchan reads as the safest thing on a Korean table for anyone avoiding meat, and it usually is, and the thing that changes it is never visible.
Tuna extract goes into one standard version by the tablespoon. Anchovy sauce goes into many home versions. Oyster sauce turns up. The enoki plate is routinely built around imitation crab.
A server who hears the word mushroom will think about mushrooms and tell you yes, because from where they are standing that is the honest answer. So ask what is in the sauce instead.
The same care applies to the version people assume is temple food. It usually is not.
Korean temple cooking excludes the five pungent roots, which are garlic, scallion, chives, wild rocambole and asafoetida, on the ground that they disturb a practitioner's mind. The standard American recipe for this dish contains two of the five, garlic and chives.
A dish can be entirely vegan and still be nothing to do with a temple.
The oil is inside it. Sesame oil is not drizzled over the top at the end. It goes into the bowl with the seasoning while the mushrooms are still being tossed, which means a finished dish cannot have it taken back out.
One style uses perilla oil instead. Nothing on the plate tells you which, and this is the sort of thing worth asking before the food arrives rather than after.
It is not going to be hot. This is a room temperature dish and it is meant to be. It loses nothing by sitting there for the length of a meal, which is the entire design.
And it is probably not going to be red. Most people arrive at a Korean table braced for heat in everything. In the sample behind this article, plain outnumbered spicy by more than two to one, and the largest group of all had no color in it beyond a few green rings of scallion.
If you have been avoiding Korean side dishes because you assumed they would all burn, this is the one that was never going to.
And nobody is telling you it is ancient. What can be checked is that Korean home cooks have posted this dish every year since 2007 without a gap, in both databases measured. Nineteen unbroken years of an ordinary weeknight side dish, which is a smaller claim than food writing usually makes and a much easier one to defend.
What Ethan Never Asked
What Ethan asked for that week was not about food.
He asked to be shown the thing the other boy did in game three. He already had a name for it. The wait.
This dish has one of those.
Everything that happens to a mushroom here happens before the seasoning does. It is cooked. Then it stops, and it sits, and somebody presses the water out of it with both hands, and only then does anything get added. After that the heat never comes back.
Take the pause out and you have mushrooms in a hot pan. Which is a real dish, a good one, and the one with the official English name.
Nobody at that table in Ohio explained any of this, because nobody explains a side dish. It is not the kind of thing that gets explained. It is the kind of thing that gets refilled.
Two boys who had spent the previous week not talking to each other ate through a table of small dishes without asking what one of them was called. Every dish on it had a name, a method, and an argument inside it about whether the pan should be involved.
The plates came back empty. That is the only review anybody took.
Next in the Banchan Deep Dives: gyeran-jjim. Every dish in this article is built by taking water out of something and then keeping the heat away from it. The next one is assembled the other way around, out of egg and water and steam, and it raises the questions this one never had to answer: whether something that arrives in its own bowl is still a side dish, what the water is actually doing in there, and what temperature has to do with any of it.
If this series is your kind of thing, subscribe. One Korean side dish at a time, until the little plates stop being a mystery.
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