It is still unclear when yam and barley rice began to be eaten together. However, it is popular that in the 1950s, "Tororo soup,'' a dish of grated yam served over barley rice, was a specialty of Shizuoka City. Tororo soup was so famous that they featured it in Matsuo Basho's haiku and Utagawa Hiroshige's The 53 Stations of the Tokaido.