Jaecheop-guk

The dish belongs to the lower Seomjin River, where the counties of Hadong (South Gyeongsang) and Gwangyang (South Jeolla) face each other across the estuary; the clean brackish water there yields the country's best jaecheop and Hadong in particular is regarded as its home. The clams have long been gathered by hand, with fishers wading the river and dragging a long-handled scoop-rake along the sandy bed to scrape them up. That traditional hand-net method, called sonteul, was recognised by the FAO as a Globally Important Agricultural Heritage System in 2023. The soup is old regional home and market cooking and no single inventor or founding date is recorded.

Thin and clear rather than rich — a pale broth that looks faintly cloudy but carries no fat. The first sip is clean and lightly saline, with a quiet sweetness behind it; the tiny clam meats are tender and slip free of their shells, and the raw garlic chives add a green, faintly pungent lift right at the end. It drinks like water that has been made savory, which is exactly why it is reached for the morning after drinking.

The broth needs no meat stock because the clams supply their own savor: jaecheop liquor is rich in glutamic and succinic acids, the same compounds that drive umami, along with sweet amino acids such as alanine and glycine, so plain water drawn through the clams turns deeply savory on its own. The faint milky tint is dissolved clam liquor and fine protein, not fat — the soup carries almost none. Because the clams are tiny they cook fast: a short simmer opens the shells and sets the meat, but prolonged boiling toughens it and clouds the liquid, so the broth is poured off the sand and the meat returned only briefly. The liver-and-hangover reputation rests on the clam being a noted source of ornithine, an amino acid central to the urea cycle that clears ammonia; it is traditionally eaten as a hangover soup rather than offered as a cure.