And it's called ốc, or "sea snails." In the streets of Vietnam, people have been eating them for centuries. That's Dan Q. Dao, a Vietnamese American travel and culture writer. He's joining me ...

There are the usual suspects such as crab, oysters and octopus, but most of the diners (of Vietnamese background) motor through sea snails, periwinkles and clams. Razor clams, especially ...