Its name literally means 'Phnom Penh noodles' — the dish followed the Phnom Penh-style kuy teav recipe into southern Vietnam and never lost the Vietnamese name for that city.
Thin, chewy rice noodles sit in a light pork-bone broth with shrimp, minced pork, liver, and a soft-boiled quail egg, garnished with fried shallots, herbs, and a squeeze of lime. Saigon noodle shops serve it either soupy or 'dry,' with the broth on the side for dipping.