Pho is a traditional Vietnamese noodle soup that originated in Hanoi. It is made with flat rice noodles, tender slices of beef or chicken, and a flavorful broth infused with herbs and spices. The dish is often garnished with fresh herbs, bean sprouts, lime, and chili peppers. Pho is a popular street food in Hanoi and can be found in numerous small stalls and restaurants throughout the city.