Plum juice is a tangy and refreshing drink that is commonly consumed in Shanghai. It is made by extracting the juice from ripe plums and adding sugar or honey to balance the tartness. Plum juice is known for its cooling properties and is often enjoyed during the hot summer months to quench thirst and provide relief from the heat. In Shanghai, you can find bottled plum juice in supermarkets or freshly squeezed plum juice at street stalls and juice bars.