Beolgyo Kkomak-muchim

Beolgyo sits on Yeoja Bay, whose mudflats yield the prized true blood cockle, and the town's cockle dishes are recorded as a representative local food of Boseong. The Beolgyo cockle holds geographical-indication status as a Korean seafood product — widely cited as the first such seafood designation, though the exact registration year is given inconsistently. The true cockle is gathered by hand from the flats at low tide rather than dredged, which underpins both its reputation and its price. Seasoned kkomak-muchim is the everyday form of the catch and the centrepiece of the kkomak-jeongsik table that the town built its food fame on.

Each cockle comes out plump and faintly chewy, holding a pocket of its own reddish, iron-rich juice that bursts briny-sweet on the bite. The dressing layers over it: salty soy, the low heat of chili flakes, garlic, scallion and a finish of toasted sesame, with no fishiness if the blanch was judged right. Served cool, it is a salty, savoury counterpoint eaten in small amounts against plain rice. Overcooked cockles that have gaped open in the pot turn rubbery and lose that signature pocket of blood — the local mark of a botched batch.

The whole technique turns on a gentle, watched blanch. The cockles are stirred in water held just below a rolling boil only until they are warmed through, because the prize is the pool of reddish liquor inside the shell — true cockles carry haemoglobin in their blood, which gives that iron-rich, faintly metallic juice. Boil them hard and the shells spring open, the liquor washes out, and the meat tightens and toughens; so cooks pull them while the shells are still mostly shut and shuck them by hand or with a coin. The flesh is then dressed cold, the soy and chili seasoning sitting on the surface rather than penetrating, so the cockle's own brine stays the dominant taste.