Umeboshi is a traditional Japanese preserved food made by salting and sun-drying ume plums. Known for its intense sourness and saltiness, it has long been valued not only as food, but as a practical ingredient that balances flavor, preserves meals, and supports everyday eating in Japan. What Is Umeboshi? Umeboshi is a Japanese pickled plum made by fermenting ume plums with salt and drying them under the sun. Although ume is a fruit, it cannot be eaten raw. Through salting, fermentation, and sun-drying, it becomes a preserved food with a sharp flavor and long shelf life. The result is ...