As for the production of manju using the steam from hot springs, there remains a record of the Edo period; according to it, at 'Furo no yu,' one of spring's sources of Atami-onsen hot springs, such steam was used for making manju.
温泉蒸気を用いて饅頭を製造した例は、江戸時代に熱海温泉の源泉の一つ「風呂の湯」で行われた記録が残る。