Pho is a Vietnamese noodle soup consisting of broth, linguine-shaped rice noodles called bánh phở, a few herbs, and meat, primarily served with either beef or chicken. Pho is a popular food in Vietnam and the specialty of a number of restaurant chains around the world. Southern Vietnamese eat it for breakfast and occasionally lunch, whereas those from northern Vietnam consume it at any time of day.
Pho originated in the early 20th century in northern Vietnam, and was popularized throughout the rest of the world by refugees during the Vietnam War. The Hanoi and Saigon styles of pho differ by noodle width, sweetness of broth, and choice of herbs. A related noodle soup, bún bò Huế, is associated with Huế in central Vietnam.
Pho is served in a bowl with a specific cut of white rice noodles in clear beef broth, with slim cuts of beef (steak, fatty flank, lean flank, brisket). Variations feature tendon, tripe, or meatballs in southern Vietnam.
Chicken pho is made using the same spices as beef, but the broth is made using only chicken bones and meat, as well as some internal organs of the chicken, such as the heart, the undeveloped eggs and the gizzard.