"Phở or pho is a Vietnamese soup dish
consisting of broth, rice noodles, herbs, and meat. Pho is a popular food
in Vietnam where it is served in households, street stalls and restaurants
countrywide. Pho is considered Vietnam's
national dish.
Pho originated in the early 20th century in northern Vietnam, and was
popularized throughout the world by refugees after the Vietnam War.
Because pho's origins are poorly documented, there is disagreement over
the cultural influences that led to its development in Vietnam, as well as
the etymology of the name. The Hanoi (northern) and Saigon (southern)
styles of pho differ by noodle width, sweetness of broth, and choice of
herbs." - Wikipedia