Kkakdugi Cube (Radish Donut Cut)

Korean radish (mu): a cultivar of the same species as daikon but shorter, rounder, and with a higher water content and sweeter, more peppery flavor. Flesh is white throughout with a green shoulder near the top. Available year-round but best in autumn and winter when starches convert to sugars.

1. 1Peel the mu using a vegetable peeler or paring knife, removing the thin skin and any green or fibrous outer layer.
2. 2Trim both ends. Quarter the radish lengthwise, then cut each quarter into lengthwise strips of ~2 cm width. Finally, cut across the strips at ~2 cm intervals to produce consistent cubes.
3. 3Toss cubes with coarse sea salt (approximately 1 tablespoon per 500 g radish) and a small amount of sugar (1 teaspoon). Let sit 30–60 minutes in a colander over a bowl — do not press or squeeze. The radish will release significant liquid.
4. 4Do not rinse the salted radish for kkakdugi (unlike baechu kimchi preparation). The released liquid stays in the batch and becomes part of the brine. Drain briefly, then toss directly with the kimchi paste.
5. 5Paste components: gochugaru (Korean red pepper flakes), minced garlic, grated ginger, jeotgal (salted fermented seafood — conventionally saeujeot, salted shrimp, or myeolchi-aekjeot, anchovy sauce), and sliced green onion. Toss until every cube face is evenly coated.
6. 6Pack into glass jars, leaving 2–3 cm headspace for gas expansion. Ferment at room temperature 24–48 hours, pressing down the cubes once daily, then refrigerate.

• Select firm, heavy mu with no soft spots or hollow sound when tapped — hollow radishes have a dry, pithy interior that does not ferment well.
• The green shoulder of Korean radish is slightly sweeter than the lower portion; including it in the same batch is fine but be aware that it may ferment at a fractionally different rate.
• A sharp knife is essential — a dull knife crushes the radish cells and produces weeping, waterlogged cubes that ferment unevenly.
• Work in batches if cutting more than 2 kg; the cubes brown slightly on cut faces when exposed to air for more than 10 minutes (enzymatic browning), though this does not affect flavor or fermentation.

• Japanese daikon — cubed

  Longer, milder, higher water content; will ferment slightly faster and produce a less sweet, more watery result. Increase salt by ~10%.

• Turnip — cubed

  Acceptable substitute with a more assertive sulfurous flavor; common in Central Asian and Middle Eastern pickled vegetable preparations using the same cube logic.

• Watermelon radish — cubed

  Striking magenta interior; flavor is milder than mu; works for fast kkakdugi (under 24 hours) but color bleeds into brine.

• Napa cabbage cross-cut for kimchi

  The companion kimchi prep cut; baechu kimchi and kkakdugi are often made together from the same paste batch.

• Daikon — batonnet

  Japanese preparation producing 4–5 cm sticks for tsukemono (pickles) and oden; shares the uniform-sizing logic for even pickle penetration.

• Brunoise (fine dice)

  Western analog for precision cubing; kkakdugi cube is a 2 cm large dice by French brigade terminology.

1. 1.Koreatown: A Cookbook — Deuki Hong and Matt Rodbard
2. 2.My Korea — Hooni Kim
3. 3.Korean Home Cooking — Sohui Kim
4. 4.The Kimchi Cookbook — Lauryn Chun
5. 5.The Art of Fermentation — Sandor Ellix Katz (lacto-fermentation science and salt concentration)

Confidence: high