Walnut is a walnut plant of Juglandaceae. Together with almonds, cashews and hazelnuts, it is known as the world-famous "four dried fruits". Walnut kernel is rich in nutrition, with protein 15 ~ 20g per 100g, more fat and carbohydrate 10g, and contains many trace elements and minerals such as calcium, phosphorus and iron, as well as many vitamins such as carotene and riboflavin, which is beneficial to human body and is one of the nut foods deeply loved by the people. Walnut shells are hard and need to be broken open to eat.