Sea rock vegetable, also known as Porphyra crispata, is a wild vegetable found along the coast and has become a expensive but popular dish. Despite its high price of about 800,000 VND/kg, it is widely sold on e-commerce platforms due to its nutritional and health benefits. The vegetable, which looks like a duck's foot, grows on sea rocks and requires specific harvesting techniques. It is considered a heaven-given treasure in coastal areas and is believed to have numerous health benefits such as reducing anemia, combating iron deficiency, and clearing heat and detoxifying the body.