Shrimp paste is produced throughout the length of the Mekong coast — wherever shrimp are landed and salt is available. The oldest coastal communities along the Gulf of Thailand and the Andaman Sea developed the fermentation as a preservation technique; the flavour contribution was the discovery that made it a culinary staple. Thai kapi (from small, pink krill) and Burmese ngapi (sometimes from fish) are the primary Mekong region versions.
Shrimp paste — kapi in Thai, ngapi in Burmese, mam tom in Vietnamese, blachan in Malay/Indonesian — is fermented shrimp or krill compressed into a solid paste. Used in very small quantities as a flavour foundation, it delivers an intense, concentrated umami depth with a specific fermented character that fish sauce alone cannot provide. The smell of raw shrimp paste is confrontational; the smell of correctly cooked shrimp paste is a revelation.
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