Prik (chilli) from the Americas

The chilli, Capsicum annuum and its close relatives, is a plant of the Americas, and it reached Southeast Asia only after the Portuguese and Spanish carried it across the oceans in the sixteenth century. David Thompson, in Thai Food, treats it as a late arrival to a cuisine that had long been pungent without it, and he places its adoption in the Siamese kitchen after contact with the Portuguese. The Thai word prik is older than the fruit it now names, and the shift in meaning is itself part of the story.

Before the chilli arrived, the heat in Siamese cooking came from pepper, Piper nigrum, from the long pepper and from ginger and galangal, Alpinia galanga, with the green peppercorn still eaten on its stem in certain curries. Thompson observes that the word prik first belonged to pepper, and that the new fruit took the name and then largely displaced the older spice in the pounded pastes. The chilli found a ready place because the Thai kitchen already built its dishes on the pounding of aromatics in a mortar, and a pungent fruit that was easy to grow slotted directly into that habit. Within a few generations it had become the defining pungency of the table, grown in every household garden and dried for the months when the fresh fruit was scarce. The Thai cook came to distinguish the chilli by size, colour and degree of fire rather than by a single type. The small, fierce prik ki nu, literally mouse-dropping chilli, gives the sharp, immediate heat of nam phrik and of salads, while the larger prik chi fa, pointing to the sky, is milder and lends colour and body to pastes. Dried long red chillies, soaked and deseeded before pounding, give the curry pastes their depth and their red, with the seeds removed when a gentler heat is wanted. Thompson stresses that these are tools of balance, and that the heat is set against salt, sourness and sweetness instead of being allowed to stand alone. The chilli also changed the structure of the great condiments. The nam phrik, the pounded relishes eaten with rice and vegetables, and the sauces served with grilled fish, took on their present character through it, as did the fresh chilli steeped in fish sauce or vinegar that sits on the table as a seasoning. In the curries, the dried chilli replaced much of the pepper in the pastes, and Thompson notes that the older, milder curries in the royal tradition show a restraint that later regional cooking abandoned. The southern kitchens, and those of the north-east, pushed the fire furthest, while the palace kitchens held to a more composed pungency in which no single note dominated. The lesson Thompson draws is that the Thai table did not simply absorb a foreign ingredient but reshaped it to an existing grammar of flavour. The chilli arrived from across the world, passed through Portuguese hands, and became so thoroughly native that it is now the first thing associated with the cuisine. That is the measure of how securely the Thai kitchen made it its own.

In the Thai kitchen the chilli is weighed against salt, sourness and sweetness, so that heat gives structure to a dish and does not overwhelm it. Fresh chillies bring a bright, quick sting to salads and relishes, while dried chillies, soaked and pounded, give the curries a rounder and deeper warmth. The table chilli in fish sauce or vinegar lets each diner adjust the fire, which is why the heat of a meal is rarely fixed by the cook alone.