Vietnam is a wonderland of street food, each dish offering a burst of flavors that define the local cuisine. Dining street-side is not only an immersion into Vietnamese culture but also a surefire way to stretch your budget. For instance, a bowl of Phở or a plate of Bánh Mì in Hanoi can cost less than a dollar at places like Phở Gia Truyền or Bánh Mì 25. Eating where the locals do not only...