Oi Muchim: Spicy Korean Cucumber Salad

Korean Cucumber Salad (Oi Muchim) is a spicy, crunchy, and refreshing Korean side dish. This short 15-minute salad combines crisp cucumbers with gochugaru, gochujang, and a savory-sweet dressing for bold, balanced flavors. Steady with Korean BBQ, grilled meats, or rice dishes.

Oi Muchim (오이무침), or Korean cucumber salad, is one of the easiest and most refreshing banchan you’ll find on a Korean table. We make it often during the warmer months when cucumbers are plentiful and we need a short side dish to go with grilled meats, rice bowls, or an unfussy weeknight meal.

This crunchy cucumber salad comes together in just minutes and is loaded with savory, tangy, slightly sweet, and gently spicy flavors from gochugaru (Korean chili flakes) and gochujang.

But here’s the thing. If you mix it like a regular salad, the cucumbers can quickly release too much water and lose their crisp texture.

After years of making oi muchim at home, we've found an unfussy trick that keeps the cucumbers crunchy and flavorful for hours. If you’ve ever ended up with a soggy cucumber salad, you’ll love this direct and classic Korean recipe.

Featured Review

“This recipe for oi munchim is without question a keeper we have ever tried! We think the combination of gochujang and gochugaru is the secret to why it’s so good!”

Franklin

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Best Ingredients for Oi Muchim

Note on key ingredients:

• Cucumbers: Korean cucumbers are traditionally used for oi muchim because they have thin skin, small seeds, and a crisp texture. Outside Korea, English, Persian, Kirby, or Lebanese cucumbers all work well. If using a large waxy American cucumber, peel the skin and remove some of the seeds for a keeper texture.
• Gochugaru (Korean Chili Flakes): This is what gives Korean cucumber salad its signature red color and gentle heat. Gochugaru varies in spice level, so start small and adjust to taste. Avoid subbing with regular chili flakes—gochugaru is key to the classic Korean flavor.
• Gochujang: A small spoonful of gochujang thickens the dressing and helps it coat the cucumbers better. It’s how our mom and grandma always made it—and to us, nothing beats this version. It adds rich depth without overwhelming the freshness.
• Gukganjang (Korean soup soy sauce): For bold umami flavor, add a splash of Korean soup soy sauce (gukganjang). Without it, the salad can taste flat—just spicy cucumbers. Gukganjang gives that deep, savory note that makes oi muchim truly Korean.

Why Oi Muchim Stays Crisp

Oi muchim is one of Korea’s most popular cucumber side dishes, but its success comes down to texture. Salting the cucumbers briefly before seasoning draws out excess moisture and helps the dressing cling better. It also keeps the cucumbers crisp instead of watery.

For a keeper texture, serve the salad shortly after mixing. While leftovers are still savory, the cucumbers will continue to release moisture as they sit.

Making Korean Cucumber Salad (Step-by-Step)

These photos are here to give you a handy visual guide. For exact measurements and detailed steps, head to the full recipe card at the bottom of the post.

1. Salt the cucumbers and drain:
Sprinkle thin cucumber slices with a little salt and let them sit for 10 minutes. Rinse the cucumbers and gently squeeze out extra moisture. Even after salting, they’ll release a little water, but that’s okay! This trick is key to avoiding soggy, diluted salad—no more watery cucumber dishes

2. Add the dressing & toss:
Add thinly sliced onion with the rest of seasoning ingredients. Using your hands, lightly toss and massage the salad (the Korean “muchim” technique) until the cucumbers are well coated.

Did you know? The “muchim” method is a old-style Korean way to gently mix and help flavors soak in, giving the salad that steady crunch! You’ll see the same technique in our Korean Spinach Namul and Kongnamul Muchim recipes.

This spicy cucumber salad is the steady banchan for Korean meals. We especially love serving it alongside classic beef bulgogi, Korean pork belly (samgyeopsal) and other grilled meats.

We originally published this recipe in June 2010. We've updated the recipe with a few changes, new photos, and more information.

• Yield: 4 people
• Prep: 15 minutes
• Total: 15 minutes

Ingredients

• 1 (200–250 g) Korean cucumber, English cucumber, or 2 Kirby pickling cucumbers
• 1/2 tsp (3 g) kosher salt
• 1/4 small onion, thinly sliced, or 1 green onion, finely chopped
• 1 tbsp (7 g) Korean chili flakes (gochugaru)
• 1/2 tbsp (10 g) Korean chili paste (gochujang)
• 1 tbsp (15 ml) rice vinegar, or white vinegar
• 1 clove garlic, finely minced
• 2 tsp (10 ml) Korean soup soy sauce (gukganjang), or salt to taste
• 2-3 tsp (8–12 g) sugar
• 2 tsp (10 ml) sesame oil, optional
• 1/2 tbsp (5 g) toasted sesame seeds

Method

1. Slice cucumbers into thin slices. around 1/8-inch, and put them in a bowl. Toss the cucumber slices with 1 teaspoon of kosher salt. Let it sit for 10 minutes. When you see some water being extracted from the cucumber, drain the water off.
2. Add the thinly sliced onion, Korean chili flakes, Korean chili paste, vinegar, garlic, Korean soup soy sauce, sugar, sesame oil, toasted sesame seeds.
3. Using your fingers and thumb, rub the Korean chili paste to loosen up and mingle with other seasoning ingredients and start tossing the cucumber all together until cucumber slices are well coated with the seasoning. Taste and add more salt if needed.
4. Serve right away or chill until ready. This salad keeps well in the fridge for 4–5 days. It’s normal for cucumbers to release a bit of liquid over time—it won’t dull the bright flavors.