Oi Muchim (Spicy Korean Cucumber Pickle)
Crisp, juicy cucumber coins are salted briefly to draw out water, then tossed with gochugaru, garlic, rice vinegar, sesame oil and toasted sesame seeds. It's a bright, spicy, tangy banchan that's ready in under 30 minutes and pairs well with rice, grilled meat or noodles.
- Prep
- 15 min
- Cook
- —
- Wait
- 20 min
- Total
- 35 min
- Makes
- About 3 cups (4 side-dish servings)
Steps
Before you start
- Choose firm Korean, Persian or kirby cucumbers; they have thin skin and few seeds, which keeps the pickle crunchy.
- Use fine sea salt for the salting step. Coarse salt is harder to measure by volume and dissolves slowly.
- Check your gochugaru: coarse flakes give a classic texture and moderate heat. Use less if yours is very hot.
- Toast raw sesame seeds in a dry skillet first if yours aren't already toasted.
Cut the cucumbers
- Scrub the cucumbers under cold water and trim off both ends.
- Slice into ¼-inch (6 mm) rounds.
- If the cucumbers are thicker than about 2 inches (5 cm) across, halve them lengthwise first and cut half-moons.
- Place the slices in the large mixing bowl.
+ Show details− Hide details
Ready when: Slices are uniform in thickness so they cure evenly.
Tip: Slices thinner than ¼ inch go limp; slices much thicker stay bland.
Salt the cucumbers
- Sprinkle the 1½ tsp salt over the cucumbers and toss with your hands to coat evenly.
- Let them sit at room temperature for 15 minutes, tossing once halfway through.
+ Show details− Hide details
Ready when: A pool of liquid has collected in the bowl and the slices bend slightly but still snap when folded.
Tip: Don't salt longer than 20 minutes or the cucumbers become too salty and soft.
Mix the seasoning
- While the cucumbers sit, combine the gochugaru, grated garlic, rice vinegar, sugar, soy sauce and sesame oil in the small bowl.
- Stir into a thick, moist, brick-red paste, mashing out any lumps of sugar.
+ Show details− Hide details
Ready when: The paste looks evenly moistened with no dry pockets of chili flakes.
Tip: Mix the paste now so the gochugaru hydrates and the color and flavor deepen.
Drain and squeeze
- Tip the cucumbers into the colander and give them a brief rinse under cold water to remove surface salt.
- Shake well, then pat dry in a clean towel.
- Press gently with your hands, squeezing out extra moisture without crushing the slices.
- Return them to the dry mixing bowl.
+ Show details− Hide details
Ready when: The slices feel damp, not dripping, and a handful gives up only a few drops when squeezed.
Tip: Squeeze gently. Wringing hard bruises the cucumber and loses the crunch.
Toss with seasoning
- Add the seasoning paste and sliced scallion to the cucumbers.
- Toss with your hands (wear a glove if you like) for about 1 minute, until every slice is coated in red.
+ Show details− Hide details
Ready when: All slices are evenly coated and glossy, with no pale patches.
Tip: Gochugaru stains plastic and fingernails; use a glass or stainless bowl.
Rest and finish
- Taste and add a pinch of salt or sugar if needed.
- Let the oi muchim rest 5 minutes so the flavors meld, then stir in the toasted sesame seeds.
- Serve right away for maximum crunch, or transfer to an airtight container and chill.
+ Show details− Hide details
Ready when: The cucumbers taste tangy, lightly sweet, garlicky and spicy, and still crunch when bitten.
Tip: Add the sesame seeds at the end so they stay visible and nutty.
Good to know
Tips
- Pat the cucumbers well after rinsing; excess water dilutes the seasoning and makes the dish watery.
- Adjust heat by changing the gochugaru by ½ tbsp up or down.
- Serve it very cold alongside rice, bibimbap, grilled pork or fried chicken to cut richness.
- Skip the rinse if you prefer a saltier pickle, and reduce the soy sauce accordingly.
Make ahead
Salt, drain and season the cucumbers up to 4 hours ahead and refrigerate; add the sesame seeds just before serving. For the crunchiest result, keep the seasoning paste separate and toss it in within 30 minutes of serving.
Storage & reheating
Refrigerate in an airtight container for up to 3 days; the cucumbers soften and release liquid after day 1 but stay tasty. Not recommended for the freezer. Serve cold or at cool room temperature; no reheating.
Substitutions
- Korean, Persian or kirby cucumbers → English (seedless) cucumber. Halve lengthwise and scoop seeds if watery; salt for 10–15 minutes. Slightly less crunchy.
- unseasoned rice vinegar → apple cider vinegar. Slightly fruitier and sharper; use the same amount.
- gochugaru (Korean chili flakes) → mild paprika plus a pinch of cayenne. Use 1 tbsp paprika and ⅛ tsp cayenne; the flavor is less smoky-sweet than gochugaru.
- soy sauce → fish sauce. Use the same amount for a more traditional, savory, funky note.
