madame thuy sells 5000 banh loc every day. the dumplings can be boiled, wrapped in banana leaves and steamed, or fried. but the real secret to her success is the filling. which she, of course, makes herself. hien: it contains shrimp, pork, bamboo shoots and mu err mushrooms from our forest. the filling is seasoned d with salt, pepper and chili. reporter: the ingredients have to be very finely chopped and well mixed. madame thuy has learned to cook them to perfection, never overcooked and never too raw. hien: my mother showed me how to make banh loc when i was still a child. later i started making them for myself, or as a gift for friends and relatives. and everybody said they were so delicious. so six years ago i decided to open my own restaurant. reporter: banh loc are a popular snack here in the province of quang binh. they're usually eaten in the morning or afternoon between meals. >> i've been eating banh loc since i was a little kid. they're really typical for our region and i love them. reporter: madame thuy gives her cu