Dasima & Dried Anchovy Stock (Yuksu)

Dasima is dried kelp — a thick, dark sheet of dried seaweed that's the Korean counterpart to Japanese kombu. On its own it's mild, faintly briny, and a little sweet; its real job is simmering into stock, where it releases glutamates that build savory depth without adding any real fishiness of its own.

Dasima almost never appears alone in a Korean soup base. The standard combination is dasima plus dried anchovies (myeolchi) simmered together in water for around ten to fifteen minutes — the anchovies bring a deeper, more assertive savory-fish character, and the kelp rounds it out and adds body. This anchovy-kelp stock, sometimes called yuksu, is the base underneath doenjang jjigae, many banchan, and countless everyday soups, which is why so many Korean recipes start with the same few lines: soak, simmer, strain.

Timing matters more than it looks like it should. Under-simmering leaves the stock thin and one-note; pulling the kelp too early (or leaving it in too long) can also make the stock slightly slimy or bitter — dasima is usually removed once the water starts to boil, while the anchovies get a bit longer to fully release their flavor. A stock recipe that says "remove the kelp, keep simmering the anchovies" isn't being fussy — that timing difference is the actual technique.

Dried anchovies for stock are usually a specific larger, less oily variety meant to be simmered and discarded (as opposed to the small, glossy anchovies used in myeolchi bokkeum, which are meant to be eaten). Using the wrong type doesn't ruin a stock, but the flavor balance shifts noticeably.

In a pinch: a plain low-sodium chicken or vegetable stock gets you a usable liquid base, but it won't have the specific umami-forward, faintly oceanic depth that dasima and anchovy bring — dishes built around that particular stock (doenjang jjigae especially) will taste noticeably flatter without it.