As there is only a river between Hekou and Vietnam, Vietnam food appeared in the urban area of Hekou in recent years. "Balut" is also a kind of gourmet food worth to taste. The price of one balut stood at 5,000 Vietnamese dongs, which is equal to 2 yuan. However, you need a lot of courage to swallow it because the so-called balut refers to boiled half-ripe duck eggs, which means that the eggs have not been completely incubated.