Khao soi Period BOrigin theory BVerified

Northern Thai Khao Soi sinks supple egg noodles into a broth of curry and coconut milk, then piles a tangle of the same noodles, fried until crisp, on top. Its present form took shape across Northern Thailand, and Chiang Mai in particular, during the nineteenth century.

The people who carried this dish into Northern Thailand were the Yunnanese Muslim traders known as the Chin Haw. From their homeland in Yunnan they organized mule caravans over the mountains, moving goods and food into the towns of the north along a route that ran from Yunnan through Burma. The curry-based noodle dish they brought closely resembled Burmese ohn no khao swe, and was originally served, in keeping with their dietary law, with chicken or beef. In the noodle shops and street stalls of the north it settled among ordinary people, mingled with local tastes, and became the egg-noodle, curry, and coconut-milk bowl eaten today. That the Chin Haw put down roots in Chiang Mai can still be seen in the Ban Haw Mosque they built there in 1905, which stands in the city to this day.

The broth carries a heavy load of spices, chili among them. Chili came from the New World, yet it had already taken hold in Northern Thailand by around the sixteenth century and was an everyday ingredient in the local kitchen well before this dish existed. What gave Khao Soi its form came later: a curry-noodle food culture, grown in Yunnan and Burma, that crossed the mountains with the caravans and arrived in this land. Out of that arrival, the bowl of today rose into being.

There is, in fact, a second dish that answers to the name Khao Soi. It comes from Luang Prabang in Laos: hand-cut rice noodles dressed with a sauce of tomato and minced pork. The name is shared, but the Northern Thai version is a coconut-and-curry egg-noodle bowl while the Lao one is a tomato-and-pork rice-noodle bowl, and neither the main ingredients nor the method overlap. No source lets us trace the two back to a single common ancestor. To fold their origins into one just because the name is shared would be a mistake.

The lineage of the Northern Thai version itself is now fairly clear. The view that the Chin Haw, moving along the trade road that ran from Yunnan through Burma into Northern Thailand, brought this noodle dish has become the settled account in food history. What began as one guess among several took its place as the account that most naturally explains the dish once scholarship on Southeast Asia based in Kyoto (Wang Liulan) traced the history of the caravan trade and the migrations that came with it.

In recent years a further refinement has been added to this account. To say flatly 'Yunnanese origin,' the argument runs, risks confusing the people who carried the dish with the land that gave birth to it. Present-day Yunnan has no dish in the Khao Soi mold, with yellow egg noodles, a crown of fried noodles, and a spiced coconut broth. That form matches Burmese ohn no khao swe instead. The long stretch during which the Lanna kingdom of Northern Thailand lay under Burmese rule (1558 to 1775) also points to a Burmese layer. The Chin Haw look less like the ones who created the dish than like the carriers who moved it along a road passing through the Shan State of Burma. The first to carry a dish and the first place to make it are not always the same.

One question, meanwhile, remains unsettled: where the name 'Khao Soi' came from. Read by its literal sense, it joins khao (rice) to soi (to cut or slice), reading as 'cut rice,' and several sources consistently connect it to a hand-cut noodle made by spreading turmeric-tinted rice flour over cloth, steaming it into a thin sheet over water, and cutting it into strips. Others hold that the Thai name was borrowed, as a sound-transcription, from Burmese or Shan. The lineage of the dish has come into view, but the origin of its name is still an open question.