What Is Kkakdugi? Korean Radish Kimchi Explained

Kkakdugi (깍두기) is one of Korea's most common kimchi varieties — cubed Korean radish (mu) fermented with gochugaru, garlic, ginger, and green onion. It's less famous internationally than napa cabbage kimchi (baechu-kimchi), but in Korea it's considered the natural partner to specific dishes, particularly rich ox bone soup (seolleongtang) and similar broth-forward preparations.

The name comes from kkakduk, describing the sound or action of cutting into cubes.

Kkakdugi vs. Napa Cabbage Kimchi

The two are made with similar seasoning — both use gochugaru, garlic, ginger, green onion, and jeotgal (fermented seafood paste) — but differ in texture, fermentation speed, and ideal use:

Texture: Korean radish (mu) is denser and crisper than napa cabbage. Where baechu-kimchi becomes silky and somewhat limp as it ferments, kkakdugi retains its crunch for longer. Well-fermented kkakdugi is crunchy on the outside and tender at the center, which is one of its characteristic pleasures.

Fermentation speed: Kkakdugi ferments faster than cabbage kimchi because the radish is cut into smaller pieces with more surface area exposed. At room temperature, kkakdugi can be ready to eat in 1-2 days (though it improves over 1-2 weeks).

Flavor: Kkakdugi tends to be somewhat sweeter and more mild when young, developing a more sour, complex character as it ferments. The radish contributes a natural sweetness and a slight peppery note that's different from cabbage.

Ideal use: Kkakdugi is the traditional accompaniment to milky white Korean beef soups — seolleongtang (ox leg bone soup), guk (clear broth soups), and similar preparations. The crunch and acidity of the radish cuts through the richness of the long-simmered bone broth. It's also eaten as part of any general banchan spread.

Korean Radish (Mu): What to Buy

Korean radish (mu, 무) is different from Japanese daikon, though they're sometimes used interchangeably:

• Korean mu: Shorter, rounder, with a dense and slightly sweet flesh. Often green near the top. Higher sugar content than daikon. This is what makes kkakdugi slightly sweet.
• Japanese daikon: Longer and more cylindrical, more peppery, milder sweetness.

For authentic kkakdugi, Korean mu is best. Find it at Korean grocery stores, where it's sold by the piece or by the pound. If unavailable, Japanese daikon makes an acceptable substitute, but the flavor will be slightly less sweet.

How to Make Kkakdugi

Makes: 1 large jar (about 1.5 liters)

Ingredients:

For the radish:

• 1 large Korean mu (radish), about 1kg / 2.2 lbs
• 1 tablespoon sea salt or kosher salt

For the seasoning paste:

• 4-5 tablespoons gochugaru (Korean red pepper flakes) — adjust to heat preference
• 1 tablespoon fish sauce (or soy sauce for vegetarian)
• 1 tablespoon salted fermented shrimp (saeujeot) — optional but traditional
• 1 tablespoon sugar or Korean pear/apple juice (for sweetness)
• 4 cloves garlic, minced
• 1 teaspoon fresh ginger, grated
• 3 stalks green onion, cut into 2cm pieces

Method:

1. Cut and salt the radish: Peel the radish and cut into 2cm (approximately 3/4 inch) cubes. Place in a large bowl. Sprinkle with salt and toss to coat. Let sit 30-45 minutes — the salt draws out moisture and seasons the radish from within.

After 30-45 minutes, taste a piece. It should be pleasantly salty. Rinse briefly with cold water (1-2 quick rinses) if it's too salty, or skip rinsing if the saltiness is right. Drain well and pat dry if possible.

2. Make the seasoning paste: In a bowl, combine gochugaru, fish sauce, salted shrimp (if using), sugar, garlic, and ginger. Mix until it forms a paste. Taste — it should be intensely seasoned, as it will season the entire batch of radish.

3. Combine: Add the drained radish and green onion to the seasoning paste. Mix with your hands (gloves recommended to avoid staining) until every piece of radish is evenly coated with the red paste.

4. Pack and ferment: Pack the kkakdugi into a clean glass jar, pressing it down so the radish is compacted and any liquid rises. Leave about 2-3cm of headspace at the top — fermentation produces gas and the mixture will expand.

At room temperature: Leave sealed at room temperature for 1-2 days. Taste daily. When it reaches a mild sourness you like (kkakdugi should be fresh-tasting and not too sour at first fermentation), transfer to the refrigerator.

In the refrigerator: Transfer directly to the refrigerator for a slower fermentation over 1-2 weeks. This produces a more controlled, less sour result. Kkakdugi fermented slowly in the refrigerator is sometimes preferred for its balanced flavor.

Shelf life: Kkakdugi keeps refrigerated for 2-3 months. It will continue to ferment slowly and become more sour over time.

How to Eat Kkakdugi

With seolleongtang or long-simmered bone soups: The classic pairing. Take a cube of kkakdugi and eat it alongside a spoonful of the milky white soup. The sour crunch of the radish contrasts the rich, collagen-heavy broth.

As banchan: Serve as a side dish at any Korean meal alongside rice and other banchan.

With grilled meat: The crunch of kkakdugi cuts through the fat of Korean BBQ.

In soups: Older, more fermented kkakdugi can be added to soup as a vegetable ingredient — similar to how aged baechu-kimchi is used in kimchi jjigae.

Why Kkakdugi Is the Best Kimchi to Start With

If you want to make kimchi at home for the first time, kkakdugi is easier than napa cabbage kimchi:

• No napa cabbage to salt and massage (labor-intensive)
• No overnight salting step
• Faster fermentation (you can taste results in 24 hours)
• Simpler ingredient preparation (cubing vs. quartering and massaging large cabbages)
• Equally good as a starter kimchi skill-builder

The seasoning ratios are the same, the fermentation principles are the same, and the result is a genuinely delicious product that's less forgiving to mess up than cabbage kimchi.

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Kkakdugi occupies a quieter place in Korean food culture than the famous baechu-kimchi — less photographed, less often seen at international Korean restaurants, but deeply embedded in the daily eating of Korea as a year-round staple that's particularly welcomed in winter alongside warming broths.

Related reading: What Is Kimchi? | How to Make Kimchi at Home | Korean Soups and Stews Guide