Its nature is flat and sweet, and it has the function of warming the stomach and strengthening the spleen. It is one of the delicious dried fruits often used as soup dishes in Guangdong and Hong Kong. Also known as Apple Fruit and Eichhornia crassipes, they are shaped like black-shelled eggs. The fruits are rich in starch, fat, sugar, protein and various vitamins. When boiled or fried, they taste like chestnuts, and cooked food is fragrant, which can be used as cooking ingredients. As mentioned in The Journey to the West, Emperor Taizong hosted a feast for four Tang Priests who returned from Buddhist scriptures, and Pingguo was one of the delicious dishes. Apple fruit also has certain dietotherapy value. According to legend, Hai Rui, a loyal minister in Ming Dynasty, was seriously ill, so his friend gave him a basket of apple fruit and cooked porridge several times, and his body recovered soon. Apple leaves can emit a light fragrance, which is favored by farmers in Huizhou, Guangdong Province, and is often wrapped as a gift to relatives and friends.