Processing the sweet potatoes

Organic sweet potatoes- kara-imo, first brought to Japan from China around 1700- are grown in the surroundings of the distillery to ensure their quality and minimal impact on the environment. In the same manner, the Yamadanichiki rice is grown in fields that are inhabited by aigami ducks which fertilise the paddies with their droppings, churn the water and encourage a biodiversity within the growing fields.
The sweet potatoes are then sorted and milled into a mash bill for fermentation.