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.
**Roasting before use:** - Shrimp paste is almost universally roasted or fried before being incorporated into a dish - Traditional method: wrap a small amount of shrimp paste in foil and place directly on a gas flame for 1–2 minutes until heated through and the aroma transforms from raw to roasted - Or: fry a small amount in oil before adding other ingredients to the pan — the fat extracts and distributes the shrimp paste's compounds through the dish **Why roasting changes the flavour:** The fermented shrimp paste contains volatile compounds that smell intensely of fermented fish in their raw state. Heat transforms these compounds: the Maillard reaction on the paste's amino acids and sugars produces complex, rounded, deeply savoury notes. The smell transition from raw to roasted is dramatic and immediate — the confrontational rawness disappears and is replaced by a compelling, rich umami. **Quantity:** Very small amounts — 1 teaspoon of kapi is sufficient to flavour a dish for 4–6 people when used as a background element. As a foreground element (in nam prik kapi dipping sauce), larger amounts may be used. Decisive moment: The aroma transition during roasting or frying. Raw shrimp paste smells of ocean and fermentation — intense, slightly ammonia-adjacent. Correctly cooked shrimp paste smells complex, rounded, deeply savoury — the fermentation note is still present but has been transformed from sharp to warm. This transition is the signal.
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