Every Korean meal I've eaten out comes with a row of small dishes before the food arrives, and this is the one I finish first. Oi muchim (์ค์ด๋ฌด์นจ) is thinly sliced cucumber tossed in gochugaru, garlic, and sesame oil. Ten minutes, no cooking.
The one step that matters is salting the cucumbers before they meet the dressing. Skip it and you get a bowl of dressing with cucumbers floating in it within twenty minutes. Salt, wait, drain, then dress, and it stays crisp.
It's the thing you want next to anything grilled or fried. If you like this, my Filipino cucumber salad is the vinegar-forward version I grew up with.
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Why You'll Love This
- Ten minutes, no cooking. Slice, salt, drain, dress. The only wait is the fifteen minutes the cucumbers sit in salt, and you can make the dressing while they do.
- It stays crisp. Salting first draws the water out before the dressing goes on, which is the difference between a crunchy salad and a bowl of cucumber soup an hour later.
- Gochugaru does something chili flakes can't. Korean red pepper flakes are fruity and mildly hot rather than sharp, and they're what makes the dressing that deep red instead of brown.
- It cuts through anything rich. Korean BBQ, fried chicken, pork belly. This is the dish that resets your palate between bites, which is the whole reason banchan exists.
- Five minutes of prep gets you a week of side dishes. Double it and you have something ready to put next to dinner for a few days, though it's best on day one.
What Is Oi Muchim?
Oi muchim (์ค์ด๋ฌด์นจ) breaks down simply: oi is cucumber, muchim means tossed or seasoned in a sauce. So the name is more or less "seasoned cucumber," which is exactly what it is.
It's banchan, one of the small dishes that arrive before the main food at a Korean meal and get refilled without you asking. Banchan aren't appetizers, they're eaten alongside everything else, and a spicy cucumber is there to cut through whatever rich thing you're eating.
It isn't cucumber kimchi. The seasonings overlap, gochugaru and garlic and fish sauce, but oi kimchi is fermented and keeps for weeks. Oi muchim is dressed and eaten the same day. If yours has been in the fridge for a week, it hasn't turned into kimchi, it's just gone soft.
Ingredients
Here's what you'll need:
- Persian cucumbers: Thin-skinned, few seeds, and crisp. Slice them about โ inch thick, thin enough to take the dressing but thick enough to keep some snap. English, Japanese, or Korean cucumbers all work the same way. Avoid standard American slicing cucumbers, the skin is tough and the seed core turns watery.
- Salt: For drawing water out of the cucumbers before they're dressed, not for seasoning. Coarse salt is easier to distribute evenly. This is a separate step from the dressing and it's the one that decides whether the salad stays crisp.
- Gochugaru: Korean red pepper flakes, and worth buying rather than substituting. They're fruity and mildly hot rather than sharp, and they give the dressing that deep red color. Italian red pepper flakes are hotter, harsher, and turn it orange-brown.
- Garlic: Fresh and minced fine. Powder doesn't work here, since there's no cooking to soften it and you want that raw bite.
- Soy sauce: The savory base. A small amount, since the salt from the cucumber step is already in play.
- Fish sauce: Depth that soy sauce alone doesn't give. Leave it out for a vegan version and add a little extra soy.
- Rice vinegar: The tang. Distinctly milder than white vinegar, so don't swap one for one.
- Sesame oil: Toasted, added at the end rather than cooked. It's the aroma you notice first and a teaspoon is plenty.
- Sweetener: Agave, sugar, honey, or monk fruit. It's there to balance the vinegar and the heat, not to make the salad sweet.
- Green onions: Sliced thin, folded in at the end.
- Toasted sesame seeds: Scattered on before serving for a nutty crunch. Black and white together looks better than either alone.
Why You Salt the Cucumbers First
Cucumbers are about 95% water, and dressing them straight away gives you a bowl of diluted dressing with soft slices in it within twenty minutes. Salting pulls that water out first.
Toss the slices with salt, leave them 10 to 15 minutes, then drain and pat dry. You'll be surprised how much liquid comes out. What's left stays crisp and takes the dressing instead of watering it down.
Don't squeeze them. Wringing them out bruises the flesh and costs you the snap. Drain and blot. And if you salted heavily, give them a quick rinse first, or the finished salad reads salty on top of the soy sauce.
How to Make Korean Cucumber Salad
- Slice and salt the cucumbers. Cut them about โ inch thick. Toss with salt in a colander and leave 10 to 15 minutes.
- Make the dressing while they sit. Whisk the minced garlic, gochugaru, soy sauce, fish sauce, rice vinegar, sweetener, and sesame oil in a small bowl.
- Drain and dry the cucumbers. Tip out the liquid and blot the slices with a towel. Don't squeeze them, it bruises the flesh and costs you the crunch.
- Toss everything together. Cucumbers, green onions, and dressing in a bowl, gently, until evenly coated.
- Serve within 15 minutes. Ten to fifteen minutes lets the dressing settle in without the cucumbers going soft. Scatter the sesame seeds on right before it goes to the table.
What to Serve This
- Kimchi fried rice. The pairing I make most. Both are spicy and sour, but the salad is cold and crunchy against a hot, soft plate of rice.
- Tteokbokki. Chewy rice cakes in a sweet, heavy gochujang sauce. You need something sharp on the side or it gets one-note fast.
- Soy garlic chicken. Sticky and rich. This is what the salad is for, cutting through something glazed.
- Buldak corn cheese. Melted cheese and sweet corn, which is about as far from a cold cucumber as you can get. That's the point.
- Chicken karaage. Japanese rather than Korean, but fried chicken and pickled cucumber is a pairing that works across every cuisine that has both.
- Korean BBQ, if you're grilling. Bulgogi, galbi, pork belly. This is where oi muchim actually lives, on a table covered in small dishes next to something cooking in the middle.
Storage
Best the day you make it. Oi muchim isn't a make-ahead dish. The cucumbers keep releasing water no matter how well you salted them, and by day two the crunch is mostly gone.
Fridge, up to 2 days. Airtight container. Pour off the liquid that collects at the bottom before you store it, and again before serving.
Reviving day-two leftovers. Drain, add a small splash of vinegar and a pinch more gochugaru, and toss. It won't be crisp again, but it'll taste bright rather than flat.
Softened leftovers still have a use. Chop them and stir them into fried rice, spoon them onto a rice bowl, or pile them into a sandwich or a taco. The texture that makes them poor as a salad makes them good as a topping.
Don't freeze it. Cucumbers turn to mush and there's no coming back from it.
If you want to prep ahead, slice the cucumbers and mix the dressing separately, then keep both in the fridge and combine 15 minutes before you eat. That gets you most of the convenience with none of the sogginess.
Rose's Tips
- Salt and drain, always. Ten to fifteen minutes in salt, then drain and blot dry. This is the whole difference between a crisp salad and a bowl of diluted dressing. Don't squeeze the slices, it bruises them and costs you the snap.
- Slice thin and even. About โ inch. A mandoline gets you there faster and more evenly than a knife, though a knife is fine if you take your time. Uneven slices means some pieces are soggy while others are barely dressed.
- Taste before it hits the table. Gochugaru brands vary in heat and soy sauces vary in salt, so the same measurements don't land the same way every time. Adjust once it's tossed, not before.
- Buy real gochugaru. It's fruity and moderately hot rather than sharp, and it's what makes the dressing that deep red. Italian chili flakes make it spicier and browner, which isn't the same dish.
- Sesame seeds go on last. Scatter them right before serving. Stirred in early they lose their crunch in the dressing.
- Make it 15 minutes before you eat. Long enough for the dressing to settle in, short enough that the cucumbers are still crisp. Not an hour ahead, and not in the fridge overnight.
Recipe FAQs
The cucumbers weren't salted before dressing, or they weren't drained long enough. Cucumbers are about 95% water and it comes out whether you draw it out first or let it pool in the bowl later. Toss the slices with salt, leave them 10 to 15 minutes, then drain and blot dry before the dressing goes on.
Gochugaru is Korean red pepper flakes, fruity and mildly hot rather than sharp, and it's what gives the dressing its deep red color. Italian red pepper flakes will make it spicy but harsher and more orange-brown. It's worth buying, and a bag lasts a long time in the freezer.
Persian, English, Japanese, or Korean cucumbers. Anything thin-skinned with few seeds. Standard American slicing cucumbers have tougher skin and a watery seed core, so if that's what you have, peel them and scrape the seeds out first.
No. The seasonings overlap, but oi kimchi is fermented and keeps for weeks. Oi muchim is dressed and eaten the same day. If yours has been sitting in the fridge, it hasn't become kimchi, it's just gone soft.
Not assembled, the cucumbers keep releasing water. But you can slice them and mix the dressing separately, keep both in the fridge, and combine 15 minutes before serving.
Yes. Leave it out and add a little extra soy sauce. You lose some depth but it still works, and it makes the dish vegan.
As spicy as you make it. Gochugaru is moderate heat, so start with a teaspoon and add more after you taste. It's easier to add than to take out.
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Korean Cucumber Salad (Oi Muchim)
Equipment
- 1 small bowl
Ingredients
- 5 pieces Persian cucumber
- 4 stalks green onions
- 1 tablespoon toasted sesame seeds black and white
- 2 cloves garlic
- 1 tablespoon soy sauce
- 2 teaspoon blue agave
- 1 tablespoon gochugaru
- 1 teaspoon fish sauce
- 1 teaspoon rice vinegar
Instructions
- In a mixing bowl, combine the thinly sliced cucumbers and green onions.
- In a separate small bowl, whisk together the minced garlic, soy sauce, blue agave, gochugaru, fish sauce, and rice vinegar to make the dressing.
- Pour the dressing over the cucumbers and green onions in the mixing bowl.
- Toss the salad gently until the cucumbers and green onions are evenly coated with the dressing.
- Let the salad marinate in the refrigerator for at least 30 minutes to allow the flavors to meld together.
- Before serving, sprinkle the toasted sesame seeds over the top of the salad for garnish.
- Enjoy your refreshing Korean cucumber salad as a delicious side dish or appetizer!
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