Red Curry Paste (Krung Gaeng Phet Daeng)

Red curry paste is central Thai in character — it reflects the cooking of the Bangkok royal court and its surrounding regions, where dried chillies from the south and aromatic herbs from the central plains came together with the shrimp paste that is the fermented foundation of most central Thai seasoning. Thompson traces the paste's components to their individual regional and historical origins and insists that the balance between its aromatic ingredients has been refined over generations of professional and domestic cooking.

The foundational red curry paste of the Thai kitchen — built on dried long red chillies soaked and pounded with lemongrass, galangal, kaffir lime zest, coriander root, garlic, shallots, white pepper, coriander seed, cumin, and shrimp paste. Red curry paste is the most versatile paste in the Thai repertoire and the correct place to begin understanding paste construction: its components represent the full range of Thai aromatic materials, and its technique is the standard from which all other pastes are variations. Red curry paste correctly made is a deep, brick-red paste of pungent, complex depth — it should smell simultaneously of dried chilli heat, lemongrass brightness, the earthy resin of galangal, and the sea floor of the shrimp paste.

The flavour chemistry of red curry paste is a study in the fat-solubility of aromatic compounds: virtually every aromatic component — lemongrass's citral, galangal's galangin, kaffir lime's limonene, the chilli's capsaicin — is fat-soluble rather than water-soluble. This means they dissolve into the coconut fat during the cracking and frying stage and are distributed through the curry's fat phase throughout the dish. As Segnit notes, chilli heat (capsaicin) and fat is a well-understood interaction: capsaicin binds to fat and is released on the palate as the fat melts — this is why a coconut-cream-based curry delivers heat differently from a water-based soup. The fat extends the capsaicin's contact time with the palate receptors, producing a sustained, building heat rather than an immediate spike.