It is said that tororo soba originated during the Taisho period, when a restaurant at the foot of Mt. Takao served buckwheat noodles with the grated yam topping to boost energy of worshippers who were on their way up to the temple on the mountain-top.
大正時代、山を登る参拝客に精をつけてもらおうと麓の店が提供したのが始まりといわれている。