Quang Binh province is not only famous nationwide for Phong Nha Caves listed as the World Heritage Sites but for its delicious specialties also. The province is well-known for various dishes made from oysters. Fresh oysters caught from Nhat Le river are processed into different dishes such as fried oysters clamped in rice papers, oyster sour soup, etc. However, oyster gruel is the most popular one that has won many visitors' hearts.

After removed shells, oysters are spiced with onions, fish sauce, chilies, peppers and fat. Then they are put into the boiled gruel. The dish is sweet, greasy and best served when it is still hot. It is also an ideal food for those who catch a chill. It would be incomplete when visiting Quang Binh province without enjoying oyster gruel.