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.
{"Salt ratio is 1:1 (shrimp : sea salt by weight) — insufficient salt allows pathogenic bacteria to proliferate; excess salt stops all enzymatic activity","Cool fermentation temperature (5–15°C) is required — this range favours endogenous protease activity while suppressing harmful bacteria; the traditional underground onggi cellar approximates this","The shrimp must be of the correct species (젓새우, Acetes chinensis) — larger shrimp varieties produce a coarser texture; the tiny silver-pink acetes shrimp produce the classic creamy, pale-pink result","Fermentation stage determines use: 1-month saeujeot is pale and mild for kimchi; 12-month is dark, intensely savoury, for direct banchan use"}
A practitioner evaluates saeujeot quality by colour (pale pink is fresh and mild; deep amber-pink is aged and intense) and by the clarity of the brine (the liquid should be clear, not cloudy — cloudiness indicates bacterial contamination). Top-quality saeujeot comes from the Chungcheong coast (충청도) — particularly the Yeonggwang and Ganghwa island producers. When seasoning baechu-kimchi, the saeujeot is blended first with gochugaru and garlic before applying to the cabbage — the blend tempers the raw saeujeot intensity.
{"Using iodised table salt — iodine inhibits lactic acid bacteria and slows fermentation; coarse sea salt only","Fermenting at room temperature — accelerates spoilage bacteria rather than controlled protease activity; the ferment sours rather than develops","Using the same age of saeujeot for all applications — mild, young saeujeot for kimchi seasoning; aged, strong for banchan use"}