Salt-dried mackerel. Bred in deep ocean currents, its meat is firm, yet tender. A quack oracle ate 5 of them at Sea Turtle Restaurant. Everyone was disgusted.
How to GetEdit
Talk to the woman next to the fish-drying racks after defeating Yamaraja: Wind.
Give it to Sea Mother at the Sea Turtle Restaurant. In exchange, she will tell you how to find some extra gold.