Kimchi
The national side dish
Kimchi is fermented napa cabbage seasoned with gochugaru, garlic, ginger, scallion, fish sauce, and salted shrimp. Left to ferment in earthenware onggi jars (or now, kimchi fridges), it develops a tangy, gassy, almost effervescent funk that sharpens any bite of rice. There are over a hundred regional variants — radish kkakdugi, water-based mul kimchi, summer cucumber oi sobagi — but napa cabbage baechu kimchi is the one most Koreans grew up watching their family make every fall during kimjang.