Bún ốc (“snail noodles”) is a Hanoi’s speciality. It is famous for its red broth and its unique, sour taste called “bỗng”. The ingredients are tangled white rice vermicelli noodles (similar to regular white rice vermicelli noodles but thinner) and boiled Helix Snails. Bún ốc can be served in two different ways: in its broth (called "hot snail noodles") or with broth in a separate bowl (called "cold snail noodles") with vegetables. The broth is made from stewed bones, tomatoes and other ingredients. “Cold snail noodles,” which are eaten by dipping the noodles in the broth, is the favourite type during the summer.