In Korea, kimchi doesn’t come as one thing you put next to rice. It comes as a small rotation, and which one lands on the table depends on what else is in the bowl. Next to a clear broth — a bone soup, a noodle soup, anything mild and long-simmered — the kimchi that shows up is almost never the deep-red napa cabbage kind. It’s kkakdugi, cubed and crunchy, because a soup that took hours to get clear and mellow needs something sharp sitting next to it, not something that competes with it.
That’s the whole logic of this dish. Kkakdugi (깍두기, roughly kkak-doo-gi) is diced radish kimchi, and it’s built to be crunchy in a way napa kimchi generally isn’t — dense Korean radish holds its bite through weeks of fermentation, where cabbage leaves go soft. Order seolleongtang, the milky ox-bone soup, or gomtang, or a bowl of sujebi, and kkakdugi turns up automatically, no one at the table thinking twice about it. It’s less a side dish than a piece of soup-eating equipment.
Quick facts
- Total time: about 1 hour 15 minutes active and waiting, plus 1 day to start fermenting
- Makes: roughly 1.2 kg / 2.6 lb finished kimchi
- Difficulty: easy, with one step that rewards patience
- Spice level: 2 out of 5, mild compared to most red kimchi
- Vegan-friendly: yes, with the fish sauce and shrimp swapped, noted below
Why it’s cubed and why that liquid matters
Korean radish, mu, is denser and less watery than daikon, which is the reason it holds its crunch through fermentation instead of turning limp. Cubing it, rather than slicing it the way you would for most quick pickles, does two things at once: it exposes more surface area to the salt, and it gives the finished kimchi a shape that’s genuinely easier to eat with a spoon alongside soup, rather than needing scissors or chopsticks the way whole-leaf kimchi does.
The step most home cooks skip, because it looks like dirty dishwater and no other kimchi recipe asks for it, is saving the liquid that drains off the salted radish. Salting pulls a surprising amount of water and natural sugar out of the radish, and that liquid is already seasoned — throwing it away and starting the paste with plain water gives you a thinner, less rounded kimchi. Blooming the gochugaru directly in that reserved liquid instead of water is a small move that changes the whole result.
Ingredients, and what to use instead
| Ingredient (for about 1.2 kg) | Where to get it, or what to use instead |
|---|---|
| Korean radish (mu), 1 kg | Korean or pan-Asian grocer. Daikon works, but it’s sweeter and holds less water, so shave 15 minutes off the salting time |
| Gochugaru, 1/3 cup | Sold online everywhere now. No real substitute for the color and fruity edge; see our pantry guide if this is new to you |
| Fish sauce, 2 tbsp | Any Thai or Vietnamese brand works. Vegan swap: 1 tbsp soy sauce plus 1/2 tsp salt, and add an extra 1/2 tsp sugar since it comes out flatter |
| Salted shrimp (saeujeot), 1 tbsp | Korean grocer, refrigerated section. Skip it and add 1 tsp more fish sauce instead |
| Garlic, ginger, scallions, sugar | Standard supermarket items |
Kkakdugi Recipe
Ingredients
Method
- Peel the radish and cut it into even 2 cm / 3/4 in cubes. Even cubes matter here more than in most kimchi — uneven pieces salt and ferment at different rates.
- Toss the cubes with 3 tbsp salt and 1 tbsp sugar in a large bowl. Let them sit 45 to 60 minutes, tossing once halfway, until the edges look slightly translucent and a pool of liquid has collected at the bottom.
- Drain the radish in a colander set over a bowl, and keep that drained liquid. Do not rinse the cubes and do not discard the liquid — both go back in later.
- Whisk the gochugaru into 3 tbsp of the reserved radish liquid and let it sit 10 minutes to bloom into a deep red paste.
- Stir the fish sauce, salted shrimp, garlic, ginger, and the second tsp of sugar into the bloomed gochugaru paste.
- Add the drained radish cubes and scallions to the paste. Toss by hand, gloved if you’d rather not smell like chili, until every cube is coated red.
- Pack the kimchi into a clean container, pressing down so the liquid it releases rises close to the top of the solids.
- Leave it at room temperature for 1 day, then move it to the refrigerator. It’s edible right away, but better after 3 to 4 days.
How to make it
- Cut the radish into even 2 cm cubes. Even sizing matters more here than in most kimchi, since uneven pieces ferment unevenly.
- Toss with the salt and 1 tbsp sugar. Let it sit 45 to 60 minutes, tossing once, until the edges look faintly translucent and liquid has pooled underneath.
- Drain the cubes over a bowl and keep that liquid. Don’t rinse the radish and don’t tip the liquid down the sink.
- Whisk the gochugaru into 3 tbsp of the reserved liquid and let it bloom for 10 minutes into a thick red paste.
- Stir in the fish sauce, salted shrimp, garlic, ginger, and the second teaspoon of sugar.
- Add the radish and scallions, and toss by hand until every cube is coated.
- Pack tightly into a clean container, pressing so the released liquid rises near the top.
- Leave it out for a day, then refrigerate. It’s ready to eat immediately and better in a few days.
Where this goes wrong
Skipping the salting wait is the most common mistake, and it’s tempting because kkakdugi looks like it should be quick. Under-salted radish stays too wet and dilutes the paste, and the cubes turn soft in the fridge instead of staying crisp. Give it the full 45 minutes.
The second mistake is rinsing the radish out of habit, carried over from making napa kimchi. Kkakdugi doesn’t get rinsed. The salt that clings to the cubes is part of the final seasoning, and rinsing it off along with the reserved liquid leaves you short on both salt and flavor.
Storage
Kkakdugi keeps for a month or more in a sealed container in the fridge, and like any kimchi it keeps changing the whole time — mild and crunchy in the first few days, sharper and more sour by week two, and fully sour by the time it’s a month old. Old, well-fermented kkakdugi is genuinely preferred for soup, since the sourness is exactly what cuts through a rich broth. It’s rarely thought of as “past its best” the way a lot of Western pickles are.
Fresh versus aged, and why both have fans
Kkakdugi divides opinion in a way baechu kimchi mostly doesn’t. Some people want it a few days old — still crunchy, only lightly sour, closer to a spicy pickle than a fully fermented one. Others specifically hunt down the oldest jar in the fridge, because a month-old kkakdugi has turned sharply sour in a way that cuts through fatty broth far more effectively than a young batch does. Neither preference is wrong. Restaurants serving seolleongtang tend to keep both around, a fresher batch for customers who want mild and a well-aged batch for the regulars who ask for it specifically. If you’re making a batch at home and can’t decide, splitting it into two containers and eating from one earlier than the other is a reasonable way to get both experiences out of a single recipe.
Frequently asked questions
Can I make kkakdugi with daikon instead of Korean radish?
Yes, and it’s the most common substitute outside Korea. Daikon has more water and less sugar, so it turns out slightly softer and less sweet. Cut the initial salting time to about 30 minutes to avoid over-softening it.
Why is my kkakdugi watery instead of crunchy?
Almost always under-salting. If the cubes didn’t sit long enough for real liquid to pool during salting, they hold onto too much water once they’re in the fridge, and the texture goes soft within a week instead of staying crisp for a month.
What soup does kkakdugi actually go with?
Any clear or milky bone-based soup — seolleongtang, gomtang, galbitang, and noodle soups like sujebi — is the traditional pairing. The idea is contrast: a long-simmered, mellow broth gets something crunchy and acidic next to it, rather than more of the same softness.
The rest of the kimchi shelf
Kkakdugi isn’t a stand-alone project so much as one entry in a small family. If you want the classic version this whole category is built on, baechu kimchi is the full leaf-by-leaf method, and if a weekend project is more than you want right now, easy mak kimchi gets you sour, cookable kimchi in about half an hour using the same underlying logic. And if summer produce is what’s in your kitchen rather than radish, oi sobagi, stuffed cucumber kimchi, is the warm-weather cousin of this dish — quicker to make and meant to be eaten within days rather than aged for weeks.