Khao Soi Period COrigin theory BVerified

Lao Khao Soi is a bowl of hand-cut rice noodles in a red sauce of tomato and minced pork, with fermented soybean served alongside. It belongs to Luang Prabang and the country around it, made in noodle shops and home kitchens — not feast food but ordinary daily fare. The rice noodles, the pork and the fermented soybean are all long-established local foods, on Lao tables from early on.

The tomato is the newcomer. A New World crop, it spread into the Old World along the sea trade and found its way into Southeast Asian kitchens. Two things meet in this bowl: rice noodles made and cut by hand, and a sauce of tomato and minced pork simmered down to a deep red.

The dish took its present shape between the nineteenth century and the early twentieth, in the same years that traders coming over the mountains from Yunnan settled in northern Laos. Mule caravans worked the road from Simao through Phongsali to Luang Prabang, and in time the men who drove them put down roots in the town and the country around it. What arrived was not only cargo. The cooking of their own kitchens met the rice noodles of the place and became a bowl sold in the noodle shops.

The year itself cannot be pinned down. No mention of the dish in writing has yet come to light, and the most that can be said is that it belongs somewhere between the nineteenth century and the early twentieth. In Luang Prabang, shops still cut their rice noodles by hand.

The name Khao Soi is shared with the egg-noodle curry of Chiang Mai in northern Thailand, but the two bowls are separate lineages. Hand-cut rice noodles under tomato and minced pork on one side, egg noodles in coconut curry on the other: they share neither their main ingredients nor their method, and no source traces them back to a common ancestor. A shared name is not shared descent. In Lao the words mean 'cut (soi) rice (khao)' and name the hand-cut noodle itself, and the closest relative is the Shan Khao Soi of Myanmar — likewise hand-cut rice noodles under a sauce of tomato and meat.

The tomato enters the written record of Southeast Asia later than one might expect. The earliest appearance so far known is on Ambon in the Moluccas, where Rumphius's Herbarium Amboinense describes the Tamatte grown in garden beds and used in the kitchen; its author died in 1702. On the Vietnamese mainland the fruit is recorded in 1790, in Loureiro's Flora Cochinchinensis. In neighbouring Upper Burma it is called abundant in 1860, in Mason's Burmah. No source has yet been found that places tomatoes in the Lao interior in the mid-seventeenth century, and there is no footing on which to carry this bowl back to the middle of that century.

The caravan network of the Yunnanese Muslims — the Haw, or Chin Haw — was already in motion in the early seventeenth century, but that is the history of the trade, not of the dish. The caravans swelled in the nineteenth century, working the road from Simao through Phongsali to Luang Prabang, and their people settled in northern Laos across the late nineteenth and early twentieth centuries. Forbes, writing on the Cīn-Hô caravan trade in the Journal of Asian History in 1987, and an essay in the Kyoto Review of Southeast Asia set out those routes and those decades from the records the trade left behind. The account that ties Lao Khao Soi to the Yunnanese stands today as the settled one.

What stays undecided is who made it first. Migrants from Yunnan may have carried in a finished dish; or the bowl may have grown up in northern Laos under the influence of their trade, out of local rice noodles and a sauce learned along the road. No source separates the two, and both readings stand. Caravans came through, people settled, and the cooking of their kitchens became the everyday food of the town: that much can be said. Only the first move remains open.