Pho is a traditional Vietnamese beef noodle soup. The spiced broth takes hours to simmer and prepare. The beef (my favorite) is sliced very thin and put in at the last minute before serving. The hot broth cooks the beef. I've eaten Pho at many Pho shops. Pho Duy's is as good as it gets. I doubt if a street vendor in Saigon could make it any better. My wife and I have been there many times. This is a university town and I usually see some of the asian students eating lunch or dinner there. That's a testament to the authenticity. As far as quantity, Most people couldn't finish the large bowl. I barely make it through the medium size. My wife never orders more than the small bowl.