Large steaming - Oofukashi

…After that, reports of roasted sweet potato shops ceased, but one appeared in Edo around the Kansei era (1789-1801). At first, they sold steamed sweet potatoes all year round, and they were called "Oofukashi." Soon, a store called "Hara no Roasted Sweet Potato" opened near Benkeibashi Bridge in Kanda (currently around Iwamotocho 2-chome, Chiyoda Ward) and became popular, and from then on Edo entered the golden age of roasted sweet potatoes. …

*Some of the terminology that refers to "Omushi" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…その後，焼芋屋の記事はとだえ，寛政(1789‐1801)ころ江戸に出現する。初めは一年中蒸芋を売り，その蒸芋は〈大蒸し（おおふかし）〉と呼ばれたという。やがて神田の弁慶橋近く(現，千代田区岩本町2丁目あたり)に〈原の焼芋〉と通称された店ができて評判になり，以後江戸は焼芋全盛時代を迎えた。…

※「大蒸し」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報