Fugunoko Nukazuke is a delicacy handed down in the Mikawa district of Hakusan City, Ishikawa Prefecture, and other areas, made by salting and then rice-bran pickling the ovaries of pufferfish, which contain the deadly poison tetrodotoxin, fermenting them slowly for two to three years to detoxify them before eating. It is a fermented food with a long history, prized since the Edo period as a gift presented to the Kaga domain. The disposal of the highly poisonous organs is normally required by the Food Sanitation Act, but in Ishikawa, because it is a traditional industry continuing since the Edo period and no accidents have been reported over many years, its production is permitted only to operators licensed by the prefecture. Exactly how the poison is removed is still not fully understood scientifically even today; it is an extraordinary fermented food transformed into a safe delicacy through methods and experience passed down across generations. Thinly sliced, it is enjoyed as an accompaniment to sake or as a topping for ochazuke.
Origin
It is said to have begun as pufferfish brought from the direction of Hokkaido, pickled in rice bran as food for ship voyages and winter preservation. In the Edo period, its delicious flavor also led to its use as a gift presented to the Kaga domain, and it is said to have been favored even by the domain's lord.
History
Under a 1983 revision to the Food Sanitation Act, the organs of poisonous pufferfish were, in principle, required to be entirely discarded, but because Ishikawa Prefecture's method is a traditional technique continuing since the Edo period and no cases of poisoning have been reported over many years, the prefectural governor permits only licensed operators to manufacture and sell it. Today, the main production areas are the Mikawa district of Hakusan City, as well as Kanaiwa and Ono in Kanazawa City, and Wajima City.
Features
The pufferfish ovaries are salted for roughly six months to a year, then pickled in rice bran and fermented for one to three years. Salting alone reduces the toxicity to about one-tenth, and the subsequent rice-bran pickling is said to render it nearly nontoxic, though the exact mechanism by which the toxin is removed has not been scientifically clarified; safety has been maintained through generations of experience and intuition.
Main Ingredients
Food Culture
The wisdom of transforming a poisonous ingredient into a safe delicacy over a long period of time symbolizes the food culture of the Mikawa district, which flourished as a port of call for the Kitamae-bune trading ships. It is prized as an accompaniment to sake, and also enjoyed as a topping for ochazuke or onigiri.
Famous Shops
あら与
石川県白山市美川北町ル61
A long-established shop founded in the Tenpo era. Fugunoko Nukazuke (about 120–130g) is sold from around 750 yen.
View details →任孫商店
石川県白山市美川永代町甲201
Founded in the late Edo period. Produces Fugunoko Nukazuke with a commitment to natural fermentation lasting two years or more.
View details →FAQ
Q. Pufferfish ovaries are highly poisonous — why can they be eaten?
A. Fermenting them through salting and then rice-bran pickling over roughly two to three years removes almost all of the toxicity. However, the exact scientific mechanism by which the poison is removed is still not fully understood, and safety is maintained by strictly following the traditional method.
Q. Can I make it myself at home?
A. No. Under the Food Sanitation Act, pufferfish organs must in principle be discarded, and only operators licensed by Ishikawa Prefecture are permitted to manufacture and sell it. Processing by individuals or unlicensed production is prohibited by law.