Gochujang records first appear in Eumsik dimibang (1670); gochugaru itself arrived in Korea via Japan from the Americas in the early 17th century, and gochujang as a distinct fermented paste developed within a generation
Gochujang (고추장) is the most complex of the Korean jangs: a thick, sweet-savoury-spicy fermented chilli paste built on a starch-sugar substrate that is absent from doenjang and ganjang. Two main starch bases are used: meju garu (fermented soybean powder) mixed with yeotgireum (엿기름, malted barley saccharified starch) produces the traditional form; while glutinous rice (찹쌀, chapssal) steamed and cooled produces a sweeter, more paste-consistent modern version. Gochujang requires Capsicum annuum gochugaru (not gochugaru made from other species), meju powder for enzymatic activity, and salt. The starch provides fermentable sugar that drives a secondary yeast fermentation alongside the bacterial activity.
Gochujang's sweetness, heat, and deep savoury depth make it the versatile Korean seasoning that functions as marinade (bulgogi gochujang), dipping sauce base, stew backbone, and spread — the same paste in different ratios produces completely different flavour profiles depending on application.
{"The starch substrate determines the flavour profile: yeotgireum (malt) base produces a drier, more complex gochujang with caramel depth; glutinous rice base produces sweeter, smoother paste preferred for BBQ applications","Gochugaru quality is the primary variable — traditional gochujang uses sun-dried, stone-ground Capsicum annuum from Sunchang or Goesan; commercial gochugaru is significantly inferior","Surface exposure management during outdoor fermentation: store in onggi pots with breathable hanji (한지) paper covers — the surface develops a white salt-mould crust that protects the interior; remove only the crust, never discard the paste below","Minimum 6 months of fermentation for standard gochujang; 1 year for complex, deeply red paste; 3+ years for the maesilhong (reddish-black) premium grade"}
Sunchang county (순창군, North Jeolla) is to gochujang what Époisses is to washed-rind cheese — the benchmark by which all other gochujang is measured. The distinctive character of Sunchang gochujang derives from the local mineral water, the specific Capsicum annuum cultivars grown in the region, and the traditional onggi fermentation vessels. CJ Haechandle and Sempio make competent commercial gochujang; neither approaches the complexity of small-batch Sunchang production.
{"Using regular flour instead of meju garu — flour lacks the necessary enzymes from Aspergillus proteolysis that break down the starch and produce amino acids; the result is simply spicy sugar paste","Fermenting in direct sunlight — UV breaks down the gochugaru's colour compounds (capsanthin, capsorubin) producing a pale, oxidised paste; indirect heat and airflow are needed"}