Kkakdugi (cubed radish kimchi) substitutes

The best overall swap and the one that actually solves the problem. The napa kimchi brings the fermented sour heat, and the raw radish cubes bring back the dense wet crunch that makes kkakdugi worth eating. Toss them together with a tablespoon of the kimchi brine and let them sit ten minutes so the radish takes on colour and flavour.

Best for

seolleongtang, gamjatang, sundae guk, bibimbap, as a side dish with rice

The radish will taste raw and slightly peppery on day one and much more kkakdugi-like by day two as the brine works into it. Korean radish (mu) is best because it is denser and sweeter, but supermarket daikon is a good stand-in. Do not use red globe radishes here; they are too peppery and go limp.

If you have baechu kimchi in the fridge and nothing else, chop it into bite-size pieces and use it measure for measure. The flavour is right, because kkakdugi and napa kimchi are seasoned with essentially the same paste.

Best for

stews, kimchi fried rice, kimchi jjigae, any cooked dish

What you lose is texture, and it is a real loss. Cabbage leaves go silky and limp, so a bowl of oxtail soup that should have had a cold crunchy counterpoint just gets more soft sour cabbage. In cooked dishes such as kimchi jjigae or fried rice, where everything softens anyway, the difference genuinely does not matter.

Dice a peeled daikon or Korean radish into half-inch cubes. Toss with 1 teaspoon salt and 1 tablespoon sugar per two cups of radish, leave 15 minutes, drain the water off, then mix in 1 tablespoon gochugaru, 1 grated garlic clove, 1 teaspoon grated ginger, 2 teaspoons rice vinegar and 1 teaspoon fish sauce. Ready in half an hour.

Best for

seolleongtang, Korean fried chicken, grilled meat, rice bowls

This is crunchier and brighter than real kkakdugi and the sourness is sharp and vinegary rather than the round, slightly fizzy lactic tang that fermentation gives. It also has no depth yet. Left in the fridge for three or four days it starts to ferment on its own and gets much closer.

Both are cured radish and both keep an excellent snap, so they cover the crunch requirement instantly. Dice them and toss with gochugaru and a little grated garlic to push them toward kkakdugi.

Best for

as a crunchy side dish, rice bowls, with fried chicken

Distinctly sweeter and much less funky, so a stew eaten alongside it tastes rounder and less savoury. Takuan brings its own rice-bran fermented aroma that some people love and some find musty. Neither has usable sour brine, so do not expect to spoon liquid into a soup the way you would with kkakdugi.

A genuine emergency option that is more sensible than it sounds. Sauerkraut is lactic-fermented cabbage, so the sourness is the right kind of sourness rather than vinegar sharpness, and adding gochugaru and garlic gets the heat and aroma into the right neighbourhood.

Best for

kimchi jjigae, stews, stir-fries, fried rice

Squeeze it out first, because sauerkraut brine is much more sharply acidic than kimchi brine and will make a stew taste tart. It is soft rather than crunchy, and any caraway seeds in the jar will pull the dish toward Central Europe, so buy plain if you have the choice.

There is no way to get crunchy, sour, spicy and fermented all at once without either radish or time. If you have ten minutes, dice a daikon, toss it with a good pinch of salt and a pinch of sugar, and serve it cold in a small dish alongside the soup.

Best for

seolleongtang, gamjatang, any rich soup that needs a cold crunchy contrast

You get the temperature contrast, the wet snap and a clean sweetness, and you get none of the sourness or heat. Honestly, for a bowl of milky oxtail soup that is about eighty percent of the job kkakdugi was doing. Add a pinch of gochugaru if you want the colour.