Qua Seongsu is a Vietnamese restaurant in Seongsu that serves banh xeo, pho, and bun cha. The banh xeo is filled generously, and the pho is divided into a Hanoi-style menu and a king rib menu. Wait reservations can be made through CatchTable, and there are cases of entering without a wait at 11 a.m. on weekends. The bun cha comes with a light nuoc mam sauce.