"Ca xiu", commonly known as tongue shell or lamp shell, lives in the muddy part of rivers, estuaries and brackish water with a long pedicle attached to the ground, making it easier to find food.
It might have a strange appearance but is considered a delicacy in Ha Tien Town, the southern province of Kien Giang.
The dish has seasonal prices with the best time being June and August when locals eat them fresh.
They also fry them with garlic and eat with rice or ferment them to eat all year round.