The earliest known written records of plum sauce date back to the Tang dynasty (618-907 AD). During this period, plum sauce was considered a delicacy and was often served at imperial feasts. It was also used as a medicinal ingredient to relieve digestive problems and boost the immune system.
Over time, plum sauce became popular beyond the imperial court and spread throughout China. It also gained popularity in other Asian countries, such as Japan and Korea, and was eventually introduced to the Western world. Today, plum sauce is widely available in grocery stores and is enjoyed by people all over the globe.