Saeujeot-gui — Salted Shrimp and the Fermentation Window (새우젓 발효의 과학)

West and South coastal Korea; Yeonggwang county (전남 영광군) and Ganghwa island (강화도) are the most celebrated saeujeot production regions; the technique traces to the Joseon period in written records

Saeujeot (새우젓) — salted fermented shrimp — is one of the most important jeotgal (젓갈) in Korean cuisine, used as the primary seasoning agent in baechu-kimchi and across the banchan tradition. Unlike fish sauce, which is a liquid extraction, saeujeot is the whole tiny shrimp (주로 젓새우, Acetes chinensis) preserved in coarse sea salt at a ratio of 1:1 by weight, fermented in earthenware crocks at cool temperatures for 1–12 months. The fermentation is a biochemical process of controlled protein autolysis — the shrimp's endogenous enzymes (proteases) break down the muscle protein into amino acids and flavour compounds (glutamic acid, inosinic acid) that are the source of Korean kimchi's umami depth.

Used primarily in kimchi-making as a seasoning agent; eaten directly as a banchan with pork, particularly boiled pork belly (bossam, 보쌈) — the fat-rich pork and the intensely saline, funky shrimp paste is one of the great Korean flavour pairings.