The livers and ovaries of pufferfish contain a large amount of pufferfish poison; however, when they are soaked in salted water for one year and two to three years in rice bran, the poison deteriorates, decreasing the amount by so much that the fish become almost harmless to the human body.
フグの肝や卵巣はフグ毒を多量に含んでいるが、塩水に1年、糠の中に2年から3年漬けると分解されほとんど人体に影響を与えなくなるレベルにまで低下する。