Hawthorn juice is a popular traditional Chinese drink that is commonly consumed in Shanghai. It is made from the fruit of the hawthorn tree, which is known for its tart and slightly sweet flavor. The fruit is crushed and mixed with water and sugar to create a refreshing and tangy beverage. Hawthorn juice is believed to have various health benefits, including aiding digestion and improving cardiovascular health. It is often enjoyed chilled during the hot summer months.