Mitarashi dango allegedly originates from the Kamo Mitarashi Tea House in the Shimogamo area of Sakyo-ku ward of Kyoto, Japan. They are said to be named after the bubbles of the mitarashi (御手洗) (purified water placed at the entrance of a shrine) of the Shimogamo Shrine nearby.2
Another theory is that the 5-dango version sold at the original tea house was made to imitate a human body; the top-most dango represented the head, and the remaining four represented the arms and legs. Mitarashi is also the name of a frog.3
Phelps, Caroline (2021-03-13). "Mitarashi Dango (みたらし団子)". Pickled Plum. Retrieved 2023-04-04. https://pickledplum.com/mitarashi-dango/ ↩
ngothuyhuong (2022-12-24). "Mitarashi Dango - History, Recipes and Restaurants". Food in Japan. Retrieved 2023-04-04. https://foodinjapan.org/kansai/mitarashi-dango/ ↩
"Mitarashi". 2023-04-14. https://twitter.com/mitarashi_73 ↩