Fermented pastes — miso, gochujang, doenjang, shrimp paste — are concentrated umami sources built through microbial fermentation. They work differently from fresh ingredients because fermentation has already broken down proteins into glutamates and amino acids, creating depth that fresh ingredients cannot deliver in the same time.
Fermented pastes are flavour amplifiers, not primary seasonings. Miso loses aromatics if boiled — stir in at the end off the boil. Gochujang benefits from cooking — frying mellows raw sharpness. Shrimp paste transforms when bloomed in hot oil, becoming savoury rather than fishy. A small amount goes a long way. Saltiness varies by brand — taste before adding additional salt.
Miso: dissolve in warm liquid first, stir in off heat. For glazes, mix with mirin and sugar and broil. Gochujang: thin with rice vinegar and sesame oil for quick bibimbap sauce. A teaspoon of miso in any Western sauce or vinaigrette adds depth without being identifiable — they'll just taste 'better.'
Boiling miso aggressively. Not cooking shrimp paste before adding. Adding too much. Treating all miso as interchangeable — white is sweet and mild, red is strong and salty. Using gochujang as hot sauce — it's sweet, salty, and umami-rich, not just spicy.