10-Minute Spicy Korean Cucumber Salad (Oi Muchim)
Korean cucumber salad, or oi muchim, is the kind of side dish that turns a simple meal into something almost celebratory. In about 10 minutes, you get cool, crunchy cucumber coins slicked in a fiery, tangy gochugaru dressing that hits every corner of your mouth.
No stove, no fuss, just a quick salt purge to keep everything crisp. Pile it next to grilled meat, spoon it over rice, or just eat it straight from the bowl.
Why This Salad Is Always on My Table
The crunch is the real star here. Because the cucumbers get a brief salt bath and a squeeze, they stay remarkably crisp even after you toss them with the dressing.
Gochugaru gives a gentle, fruity heat that is more about flavor than fire, and the sesame oil ties it all together with a nutty backbone. A little sugar just balances things out. It is the kind of dish that wakes up your whole palate.
Ingredients
- 1 English cucumber (about 12 oz), or 2 Kirby cucumbers: any thin-skinned variety works; no need to peel
- 1/2 tsp kosher salt: for drawing out water
- 1 tbsp gochugaru (Korean red pepper flakes): the main source of heat and color
- 1 tbsp rice vinegar: adds the sharp tang
- 2 tsp toasted sesame oil: for that nutty richness
- 1 tsp granulated sugar: balances the heat and acid
- 1 clove garlic, finely minced: do not skip it
- 1 tsp toasted sesame seeds, plus more for garnish: a light, nutty crunch
- 1 green onion, thinly sliced (optional): a fresh green pop
Variations / Substitutions
- Less spicy: reduce gochugaru to 1 tsp and add a drizzle of neutral oil so the dressing still has body.
- Add onion: toss in a few very thin slices of red or sweet onion for extra crunch.
- Gochugaru swap: use half the amount of regular red pepper flakes mixed with a little paprika for color, but the flavor won’t be the same.
- Soy sauce twist: replace half the rice vinegar with a teaspoon of soy sauce for a saltier, deeper profile.
- If you like this, you will probably also enjoy our Quick Korean Spinach Salad.
How to Make Korean Cucumber Salad
Step 1: Slice the Cucumbers
Slice the cucumber crosswise into thin 1/8-inch rounds. A mandoline makes fast, even work of this, but a sharp knife works too, it should take less than a minute. You want thin but not paper-thin coins that will hold their shape and soak up the dressing.
Step 2: Salt and Squeeze the Cucumbers
Toss the slices with the 1/2 tsp kosher salt in a colander, then set it in the sink or over a bowl. Let them sit for 10 minutes while the salt pulls out moisture. After 10 minutes you will see a small pool of liquid underneath. Grab handfuls of cucumber and squeeze gently to press out more water without crushing them, then spread the slices on a clean kitchen towel and pat dry.
Step 3: Whisk the Dressing
In a mixing bowl, whisk together the gochugaru, rice vinegar, sesame oil, sugar, garlic, and sesame seeds. It will form a thick, deep red paste. Give it a taste and adjust if you want more tang (a tiny splash of vinegar) or sweetness (a pinch more sugar).
Step 4: Toss the Salad and Serve
Add the dried cucumbers to the bowl and toss until every slice is evenly coated with the dressing. Fold in the sliced green onion, if using. Transfer to a serving bowl and scatter a few extra sesame seeds over the top. Serve immediately, while the cucumbers are still cold and crunchy.
Tips for the Crunchiest Salad
- Do not skip the salt purge, even if you are in a hurry. It is the only thing that keeps the dressing from turning into a watery soup.
- Use a mandoline if you have one. Uniform slices mean the dressing clings evenly and every bite tastes the same.
- If you need to prep ahead, salt and drain the cucumbers then hold the dressing separately. Toss right before eating.
Need a bigger batch? Here is how the dressing scales.
| For 2 servings (side) | For 4 servings (potluck) |
|---|---|
| 1 tbsp gochugaru | 2 tbsp gochugaru |
| 1 tbsp rice vinegar | 2 tbsp rice vinegar |
| 2 tsp sesame oil | 1 tbsp + 1 tsp sesame oil |
| 1 tsp sugar | 2 tsp sugar |
| 1 clove garlic | 2 cloves garlic |
| 1 tsp sesame seeds | 2 tsp sesame seeds |
| 1 cucumber | 2 cucumbers |
Keeping Leftovers Fresh
- Refrigerate: store in an airtight container for up to a day. The cucumbers will release more liquid and soften, so give them a stir before serving.
- Serve cold: straight from the fridge is totally fine, just be aware the crunch fades quickly.
What to Serve With Korean Cucumber Salad
The cool, spicy crunch cuts right through the richness of fatty grilled meats like samgyeopsal or bulgogi. It also tucks beautifully into a simple bowl of steamed rice with a fried egg and a drizzle of sesame oil. Pile it next to any Korean main dish, and it instantly rounds out the meal.
Frequently Asked Questions
Can I make this less spicy?
Yes. Cut the gochugaru down to 1 teaspoon and add a teaspoon of neutral oil so the dressing still coats the cucumbers.
Can I use a regular garden cucumber?
You can, but peel it and scoop out the watery seeds first. English or Kirby cucumbers are much better because their skin is thin and the flesh stays firmer.
How far ahead can I salt the cucumbers?
About 30 minutes max. Any longer and they will start to get mushy. Rinse off the salt and pat them completely dry before dressing.
What if I don’t have gochugaru?
The closest sub is a mix of half regular red pepper flakes and half paprika for color, but it won’t have the same fruity depth. The dish will be a little sharper.
Korean Cucumber Salad Recipe
Ingredients
Method
- Slice the cucumber into 1/8-inch thick rounds.
- Toss the slices with the salt in a colander and let them drain for 10 minutes. Squeeze out excess liquid, then pat dry with a towel.
- In a bowl, whisk together the gochugaru, rice vinegar, sesame oil, sugar, garlic, and sesame seeds until a paste forms.
- Add the cucumbers to the dressing and toss to coat. Fold in the green onion if using, transfer to a serving bowl, and top with extra sesame seeds. Serve right away.
