Spicy Korean Cucumber Salad (Oi Muchim)

This Korean Cucumber Salad recipe is simple yet flavorful. Oi Muchim is a refreshing, flavorful side dish to serve with Korean-inspired recipes, rice bowls, and more!

Why You’ll Love This Spicy Korean Cucumber Salad

This is my preferred way to eat cucumbers, which I feel mostly “meh” about most of the time. But the fact that this recipe gets me excited about cucumbers should say a lot about how good it is!

• This delicious salad is mostly crisp cucumbers, but with layers of umami (savory), spicy, and sweet flavors throughout. 
• All you need is 10 minutes, a sharp knife (or a mandoline slicer) and a cutting board, and that’s it! Even measuring spoons will be optional after you make it a few times.
• If you’re on social media, you’ve likely seen some version of this cucumber salad recipe going viral on TikTok recently. Or maybe you’re just craving the taste of Korean BBQ at home. It’s so easy to recreate!

Ironically, a different cucumber recipe is one of the most popular posts of all time. Check out my Quick-Pickled Cucumbers and Onions or Cucumber Salad with Peanut Dressing and Chili Crisp if you want a slightly different version!

Korean Cucumber Salad Ingredients

• Cucumbers. Any type of cucumber with a thin skin works well. Obviously, in Korea, any oi muchim recipe is traditionally made with Korean cucumbers. That variety is less common in the United States, so my top pick is Persian cucumbers for their smaller size. You can also use English cucumbers, mini snacking cucumbers, or Japanese cucumbers. 
• Green onions. As my favorite Korean YouTube channel (Aaron & Claire) says, “more green onion, more delicious!” And I agree! I use at least one green onion, but feel free to add more or less depending on your tastes. 
• Garlic
• Soy sauce. I use low-sodium soy sauce, but you can also swap for tamari if you need a gluten-free option.
• Toasted sesame oil. Do not skip this! It thickens the seasoning sauce and helps it nicely coat each piece of sliced cucumber, plus adds so much flavor. 
• Gochugaru. Korean red pepper flakes also essential, they add a hint of spicy flavor and a striking deep red color.
• Toasted sesame seeds
• Sugar. This balances the salty, spicy flavors and only a small amount is needed.

(full ingredients list and quantities can be found in the recipe card below)

As you can see, you only need a handful of simple ingredients to make this spicy Korean cucumber salad recipe. Most grocery stores stock these items nowadays. But if you’re having any trouble, plan to visit your local Asian market if you have one, or look online for delivery options.

Swaps and Substitutions for Korean Cucumber Salad

There are endless variations of oi muchim and cucumber salad recipes out there. I haven’t tried all of them, or made most of them. But I really encourage you to explore some of these variations if they sound appealing to you. 

• Include different veggies alongside the sliced cucumber, like thinly sliced sweet onions or matchstick carrots (my favorite!)
• Add a splash of rice vinegar or fish sauce.
• Keep the sauce ingredients the same, but try it with a different type of cucumber. Or, simply slice or chop it into different shapes if you prefer.

And while this crunchy Korean cucumber salad is similar to cucumber kimchi (oi kimchi), it’s not the same! This simple salad is not fermented, although it is seasoned with some of the same ingredients you’d find in the kimchi version.

In Korean cuisine, there’s something called sohn mat (손맛), which means “hand taste.” Basically, it’s the unique flavor of a dish that comes from the hand of the cook who prepares it. In other words, your version of oi muchim will be different than mine. But even if you go off recipe, this Korean cucumber salad will soon become a favorite at your table!

How to Make Oi Muchim (Spicy Korean Cucumber Salad)

This Korean cucumber salad recipe is easy to make in minutes. It just depends on how long it takes to do the minimal slicing and chopping. After that, everything can be mixed in one large bowl.

First, slice the cucumbers into thin rounds. If you’re using a bigger type of cucumber, try slicing in half before slicing diagonally or into half-moons. Maangchi has the best example of that in her recipe for oi muchim.

Street Smart Nutrition Tip: It’s best to use a cucumber without a lot of seeds if possible. But you can’t always know that until you cut it open! If that’s the case, just use a spoon to scrape out the middle portion with all the seeds before slicing. This will help keep the cucumbers crisp for longer.

At this point, you could salt the cucumbers and let them drain excess moisture for 10-15 minutes.

Personally, this turns out too salty for my tastes, especially with regular soy sauce. But if you try this, be sure to rinse under cold water before moving on to the next steps.

Add the sliced cucumbers to a large mixing bowl, then add the rest of the ingredients: minced garlic, sliced green onions, gochugaru (Korean red chili flakes), toasted sesame seeds, toasted sesame oil, soy sauce, and a little bit of sugar.

Mix everything well, then taste to adjust the seasonings if needed. Once everything is coated in the simple sauce, you’re ready to dig in!

How to Serve Oi Muchim

Oi muchim is a Korean cucumber side dish, not a main dish. So it’s typically served alongside other banchan (small shared side dishes) to accompany a main meal. I always look forward to the array of different options at Korean BBQ or Korean restaurants.

You can easily enjoy a version of that at home! Simply portion some of the finished oi muchim into a small bowl. Serve it with white rice, japchae, or anything else you prepare for the main course. Or get creative and add it to other rice dishes or bowls. It pairs well with Kimchi Fried Rice or Chamchi Deopbap (Korean Tuna Rice Bowl).

This side dish is light and tangy. Although some might think it’s spicy, to me the heat is very subtle. It can cut through the richness of grilled meats and even be a tasty burger topping.

Korean Cucumber Salad Storage Suggestions

This recipe is best eaten within the first couple of days. While it technically can last longer than that, after the first day the sliced cucumbers will be much softer and less crispy. The cucumbers will lose water, leading to excess liquid pooling at the bottom. This could also dilute the flavor of the sesame oil, garlic, gochugaru, and other seasonings. 

If you don’t mind that, no problem! But I think it’s important to manage expectations. Here’s what I recommend:

• After preparing your oi muchim, transfer the cucumber salad to an airtight container. I personally really like the ones with the snap-on lids because they are leakproof and come in a variety of sizes, like these from Rubbermaid. 
• If leaving in a mixing bowl or serving bowl, seal tightly with press & seal wrap.
• Store in the refrigerator and use within 1-2 days for best results.

And if we’re being honest, I’ve never once had a problem with plowing through this recipe in 1-2 days. Or less! It has so much refreshing crunch, during the humid summer months this is pretty much my go-to!

Spicy Korean Cucumber Salad FAQ

Can I make a large batch for leftovers?

It depends on how many people you’re planning to serve.

When I host a big dinner, like a Seollal (Korean Lunar New Year) dinner, I double or even triple the batch. But it’s quickly eaten and leftovers are rare.

Since cucumbers are so watery, I recommend making smaller batches of oi muchim more often for better results.

What type of cucumber is the best for Spicy Korean Cucumber Salad?

You can use just any variety of cucumbers, especially if you don’t have a Korean market or Asian grocery store nearby.

For best results, use Persian cucumbers or snacking cucumbers, which are small and compact. Or, English cucumbers which are crisp with a thinner skin and fewer seeds.

Is Korean Cucumber Salad vegan or vegetarian?

It’s both!

There are no animal products used in this Oi Muchim recipe. It’s appropriate for anyone following a vegan, vegetarian, or 100% plant-based diet.

Is Korean Cucumber Salad gluten free?

No, since this recipe uses soy sauce, it is not safe for anyone with Celiac disease or a gluten intolerance.

To make a gluten-free version of this cucumber salad recipe, swap the soy sauce for a gluten-free alternative such as tamari. Tamari is a soy sauce made without wheat.

You can also use coconut aminos (which may have a more sweet flavor) or liquid aminos (such as Bragg’s).

How spicy is this cucumber salad recipe?

It’s actually quite mild, with the gochugaru contributing only a little bit of heat or spice. However, you can adjust the spice level in your oi muchim by using more or less gochugaru.

Koreans tend to value harmony in flavors, so the heat should be balanced with salty, sweet, and savory flavors. If you use a Korean brand of gochugaru, you likely won’t experience extreme spiciness in your Korean cucumber salad recipe.

If you don’t have gochugaru, you can swap for another type of crushed red pepper or red pepper flakes. However, note that there could be a drastic difference in how mild of spicy the end result will be if you modify the recipe.

And as always, thanks for stopping by the Street Smart Nutrition blog! You can find more and follow along on Instagram and YouTube, and don’t forget to sign up for my newsletter so you never miss a new post. Cheers to more fearlessly nourishing meals!

Disclosure: This post was originally published in June 2023. It has since been updated to improve the overall quality of the information and/or images.