khao soi is closer to the present day Burmese ohn no khao swè, being a soup-like dish made with a mix of deep-fried crispy egg noodles and boiled egg noodles, pickled mustard greens, shallots, lime, ground chillies fried in oil, and meat in a curry-like sauce containing coconut milk. The curry is somewhat similar to that of yellow or massaman curry but of a thinner consistency. It is popular as a street dish eaten by Thai people in northern Thailand, though not frequently served in Thai restaurants abroad.
There is some reason to believe that the Thai version of khao soi was influenced by Chinese Muslim cuisine and was therefore likely served with chicken or beef.[3]
Different variants of khao soi that are made without any coconut milk and with rice noodles instead of egg noodles are mainly eaten in the eastern half of northern Thailand.