Locals queue for phở at 6–9 AM. By evening, many famous shops are sold out or closed.
Tourist-area phở shops stay open all day but the broth has often been simmering since dawn and weakens through the day.
For authentic phở bò (beef), try Phở Gia Truyền on Bát Đàn. For phở gà (chicken), Phở Nguyệt on Phủ Doãn is a Hanoi institution.