Cucumber Kimchi Recipe (Oi Kimchi) with Gochugaru

Most home cooks ruin cucumber kimchi the same three ways. They over-salt the cucumbers and end up with shrunken, leathery batons. They use fine-grind gochugaru meant for cooking and end up with a sandy paste. They ferment for a week thinking that is the Korean way, and end up with mush. Cucumber kimchi is a quick kimchi by design, the cucumber is too delicate to handle long ferments, and the seasoning logic is precise.

Done right, cucumber kimchi is one of the great refrigerator side dishes. Crisp, bracingly cold, salty-sweet-spicy, slick with chili oil from the gochugaru bloom. It hits every contrast at once. A small dish next to grilled meat. A handful tossed into cold noodles. A snack out of the jar with a fork while you stand at the open refrigerator on a hot afternoon. The Koreans figured this out a long time ago.

The version below is a textbook fast kimchi: 15-minute salt cure (not 30), thorough double rinse, coarse gochugaru, and a 24-hour room-temperature ferment before refrigeration. The flavor curve peaks around day 3 and stays excellent through day 10. Metric and imperial measurements throughout.

What You’ll Need to Make This Recipe

A wide-mouth fermentation jar with an airlock makes the first 24 hours hassle-free, but a regular mason jar with the lid set on loose works too. Coarse Korean gochugaru is non-negotiable, fine-grind chili powder is the wrong product for kimchi. Glass storage containers are handy for transferring once the kimchi is fully fermented. A scale is genuinely helpful for the salt-to-cucumber ratio, which is the single biggest variable in how the kimchi turns out.

Recommended Reads

• Gochujang Pasta Recipe (Creamy, Spicy, 20 Minutes)
• Crispy Gochujang Tofu Recipe (Baked)
• Sambal Oelek Recipe (Indonesian Chili Paste)
• Watermelon Feta Salad Recipe with Mint and Lime
• Gochujang Chicken Wings Recipe (Sticky Korean Glaze)

Why This Cucumber Kimchi Works

The salt timing is the most important variable. Long salt cures (30 minutes or more) draw too much water out of the cucumbers and shrink them into leathery strips that taste salty even after rinsing. A 15-minute cure pulls just enough water to firm the cucumber texture without collapsing the flesh. The result is a cucumber that holds its crunch through the entire fermentation and still tastes like cucumber.

The double rinse after salting is the second hidden step. Most recipes mention rinsing once, which leaves enough surface salt to compound with the salt in the fish sauce and the kimchi paste, making the finished product taste like a salt lick. Two rinses under cold running water removes the surface salt while keeping the cucumber’s internal seasoning intact.

The coarse versus fine gochugaru question gets glossed over in most English recipes. Korean cooks use two different grinds. Coarse flakes (the kind that looks like crushed red pepper but redder) are for kimchi paste, where you want the flakes visible and the chili oils to bloom slowly into the paste over the ferment. Fine powder is for cooking and stews, where you want the chili to disappear into the dish. Buying fine gochugaru and using it for kimchi gives you sandy texture and an unbloomed harsh flavor. Get the coarse.

Cucumber Kimchi Ingredients, Briefly

Cucumbers. Persian, Kirby, or Korean cucumbers. They have thin skins, dense flesh, and minimal seeds, which is what kimchi wants. Avoid English/hothouse cucumbers, the skin is too tough and the flesh too watery. Avoid garden cucumbers with developed seeds, they go soft fast.

Coarse sea salt. For the cucumber cure. Kosher salt also works. Avoid fine table salt, the cucumbers absorb it too aggressively. Three percent of the cucumber weight is the right ratio.

Korean coarse gochugaru. Sun-dried, coarse-grind Korean red pepper flakes. The flakes should look like a coarse crushed-pepper grind, bright red, slightly oily to the touch. If your gochugaru looks like fine paprika, that is the wrong grind for this dish.

Korean fish sauce (saeujeot or myulchi aekjeot). The traditional umami base. Substitute Thai fish sauce (3 crabs brand or similar) if Korean fish sauce is hard to find. The flavor profile is slightly different but works. For vegetarian, omit the fish sauce and add 1 tablespoon of light soy sauce plus a teaspoon of white miso for umami.

Garlic and ginger. Both fresh, both minced or pasted. Avoid jarred pre-minced versions, they taste off in kimchi. The garlic-to-ginger ratio is about 3:1 by volume.

Sugar. Granulated white sugar, a teaspoon, to balance the heat and feed the fermentation. Asian pear puree is a traditional alternative for those who want to go deeper into authenticity.

Asian chives (buchu) or scallions. The traditional aromatic green. Cut into 5 cm (2 inch) lengths. Regular scallions work as a substitute if Asian chives are unavailable. Skip the chive flowers if you find them, they go bitter in the ferment.

Optional carrot and onion. Thin matchsticks of carrot and a few half-rings of white onion add color and aromatics. Both are optional but recommended.

Toasted sesame seeds. Sprinkled on top at the end. Adds nutty depth and a visual finishing touch.

Tips and Variations

Stuffed cucumber version (oi sobagi). Cut each cucumber into 4 cm (1.5 inch) lengths, then make a cross-cut down through each piece (without slicing all the way through). Stuff the kimchi paste into the cross-cuts. This is the classic restaurant presentation of oi kimchi, and it ferments slightly faster because the paste is in direct contact with more cucumber surface.

Vegetarian version. Omit the fish sauce. Replace with 1 tablespoon light soy sauce plus 1 teaspoon white miso paste whisked into the kimchi paste. The umami profile is slightly different but the result is excellent and fully plant-based.

Less-spicy version. Reduce the gochugaru to 1 tablespoon. Add a tablespoon of toasted sesame oil at the end to round out the flavor. This is a good entry point for kids or anyone new to Korean cooking.

Fermentation timeline. Day 1: fresh and crunchy, mild seasoning, the cucumber is still raw-tasting. Day 3 to 5: peak flavor, full chili bloom, slight tang from fermentation. Day 7 to 10: pleasantly sour, perfect for adding to fried rice or kimchi pancakes (kimchi jjigae or kimchijeon).

What to serve with cucumber kimchi. Korean BBQ. Grilled fish. A bowl of rice with a runny egg on top. Soba or buckwheat noodles. A bowl of cold beer on a hot day. The dish slots into nearly any meal.

Older kimchi uses. When your cucumber kimchi crosses day 10 and starts tasting properly sour, it transitions from snack to ingredient. Chop and stir into fried rice with sesame oil. Pancake batter with the kimchi juice. Brothy stew with tofu and pork belly. Old kimchi has a different life.

Recipe: Cucumber Kimchi (Oi Kimchi) with Gochugaru

Prep Time: 20 minutes | Cure Time: 15 minutes | Ferment Time: 24 hours at room temperature | Total Time: About 24.5 hours start to first eat | Yield: About 1 liter (1 quart), serves 4 to 6 as a banchan

Ingredients

For the cucumber cure:

• 700 g (about 1.5 lb) Persian or Kirby cucumbers, sliced into 5 mm (¼ inch) rounds
• 21 g (about 4 tsp / 3% of cucumber weight) coarse sea salt or kosher salt

For the kimchi paste:

• 3 tbsp (about 15 g) coarse Korean gochugaru
• 1 tbsp (15 ml) Korean or Thai fish sauce
• 3 cloves garlic (about 15 g), minced to a paste
• 1 tsp fresh ginger, grated to a paste
• 1 tsp granulated sugar
• 2 tbsp water

For the mix-ins:

• 1 small carrot (about 80 g), cut into fine matchsticks
• ½ small white onion (about 60 g), thinly sliced into half-rings
• 30 g Asian chives or 4 scallions, cut into 5 cm (2 inch) lengths
• 1 tsp toasted sesame seeds, for finishing

Instructions

1. Slice the cucumbers into 5 mm rounds. Weigh them, then weigh out 3% of that number in salt (for 700 g of cucumber, that is 21 g of salt). Toss the cucumbers with the salt in a colander set over a bowl.
2. Let the cucumbers cure for exactly 15 minutes. Toss once at the midpoint. The cucumbers should release a noticeable amount of water and look slightly translucent at the edges.
3. Rinse the cucumbers thoroughly under cold running water. Drain, then rinse again. This double rinse removes the surface salt while keeping the cucumber’s internal seasoning. Squeeze gently with your hands or a clean kitchen towel to remove excess water. Set aside.
4. While the cucumbers cure, make the paste. In a medium bowl, combine the gochugaru, fish sauce, garlic, ginger, sugar, and water. Whisk into a smooth paste. Let it bloom for 5 minutes, the gochugaru will release its color and oils into the paste.
5. Add the drained cucumbers, carrot matchsticks, onion half-rings, and Asian chives to the bowl with the paste. Wearing nitrile gloves (the gochugaru will stain your hands and skin), toss everything together until the cucumbers and vegetables are evenly coated.
6. Pack the mixture firmly into a clean 1-liter glass jar. Press down gently with a wooden spoon to remove air pockets and release a bit of liquid. Leave at least 2 cm (1 inch) of headspace at the top of the jar.
7. Set the jar lid on loosely (do not screw down tight, gases need to escape) or use an airlock fermentation lid. Let the jar sit at room temperature in a cool corner of the kitchen for 24 hours.
8. After 24 hours, screw the lid down tight and refrigerate. The kimchi is now ready to eat. Flavor peaks at day 3 and stays excellent through day 10.
9. Serve with toasted sesame seeds sprinkled on top.

Notes

The 3 percent salt ratio is the move. By weight, not by tablespoons. A digital scale is the right tool for this. Eyeballing the salt is the easiest way to end up with overly salty or under-cured cucumbers.

Wear nitrile gloves when tossing. Gochugaru oil is the kind that lingers under your fingernails for two days and stings if you happen to touch your eyes. Cheap disposable gloves are a small investment in not regretting your life choices later.

Storage and shelf life. Refrigerated and submerged in its own brine, cucumber kimchi keeps for 2 to 3 weeks. By the second week the texture softens but the flavor deepens. Old cucumber kimchi is excellent in stir fries and noodle dishes.

The room-temperature ferment is the magic step. Skip it and refrigerate immediately and your kimchi will taste like a salad with chili paste on it. Twenty-four hours at room temperature wakes up the lactic acid bacteria that make this fermented.

Frequently Asked Questions

What is the difference between oi kimchi and oi sobagi?

Oi kimchi refers to any cucumber kimchi. Oi sobagi specifically refers to the stuffed-cucumber version where whole pieces of cucumber are cut into pockets and the kimchi paste is stuffed inside. The sliced version in this recipe is also oi kimchi, just simpler to make and equally delicious.

Why coarse gochugaru and not regular chili flakes?

Korean gochugaru is sun-dried, deseeded, and ground specifically for kimchi-making. The flavor is sweeter, less harsh, and more aromatic than Italian-style crushed red pepper, which is often deseeded inconsistently and ground from different chili varieties. Coarse-grind gochugaru also blooms its color and oil slowly during the ferment, which is essential for kimchi texture and flavor.

Can I ferment cucumber kimchi longer than 24 hours at room temperature?

Not recommended. Cucumbers are too delicate for extended room-temperature ferments. Beyond 48 hours, the texture starts to break down and the kimchi turns soft and unpleasant. The 24-hour window is enough to develop initial fermentation flavor and the slow cold-fermentation continues in the fridge after that.

How long does cucumber kimchi last in the fridge?

Two to three weeks refrigerated and submerged in its brine. The first week is peak texture (crunchy and bright). The second week softens slightly but deepens in flavor. The third week is properly sour, perfect for cooking applications like fried rice or kimchi pancakes.

Can I make cucumber kimchi without fish sauce?

Yes. For a vegetarian or vegan version, replace the fish sauce with 1 tablespoon light soy sauce plus 1 teaspoon white miso paste. The umami profile is slightly different but the result is excellent. Some Korean Buddhist temple cuisine traditionally omits fish sauce, so this is not an inauthentic move.

Why did my cucumber kimchi turn mushy?

Three likely causes. The cucumbers were over-salted or salted for too long (more than 20 minutes). The wrong cucumber variety was used (English/hothouse cucumbers go mushy fast). Or the kimchi was fermented at room temperature for longer than 24 hours. Stick to Persian or Kirby cucumbers, 15 minutes of cure, and 24 hours room-temp ferment max.

Final Thoughts

A jar of cucumber kimchi in the back of the fridge changes how I cook for the next two weeks. Grilled fish gets a small dish of it on the side. Cold soba noodles get a few spoonfuls tossed in at the end. The lazy lunch of rice with a fried egg gets a transformation. The math of a 30-minute project that yields a dozen meal upgrades is impossible to argue with.

Start with one jar. Take notes on how the flavor changes day by day. The next batch you make, you will know exactly what you want differently. That is the only learning curve in kimchi-making and it is short.

Last update on 2026-08-08 / Affiliate links / Images from Amazon Product Advertising API