tonjiru

Tonjiru is a thick miso soup built around pork (ton, 豚) and root vegetables. The character 豚 entered Japanese through classical Chinese, where tún named the domestic pig as distinct from the wild boar. In China the pig had been domesticated since at least 5000 BCE, and the character appears in oracle bone inscriptions from the Shang dynasty. Japanese scribes borrowed the character along with its pronunciation during the Nara period, roughly the eighth century CE.

The second element, jiru (汁), is pure Japanese, meaning juice or broth. It appears in compound after compound across the medieval recipe literature. Tonjiru as a named dish does not appear in cooking manuals until the Meiji era, when beef and pork became legal to eat after centuries of Buddhist prohibition. The Meiji government lifted the meat ban in 1872, and pork entered the popular diet with speed.

Regional variants split the country. Western Japan often calls the dish butajiru, using the native Japanese reading of the same character (buta). Eastern Japan and Tokyo preferred the Sino-Japanese reading ton. The difference is purely phonological: both words name the pig and point to the same bowl. Soldiers ate tonjiru in military canteens during the Meiji and Taisho periods, which spread the eastern term nationally.

The soup reached its modern form by the early Showa period: miso base, pork slices, daikon, carrot, burdock, and konnyaku. Home economics textbooks of the 1930s listed it as an economical winter meal. Today it is a staple of school lunches, neighborhood festivals, and disaster-relief kitchens across Japan.