Hákarl

Subject: Hákarl
Era: Present
Related: Elbaf Giants Sun God Nika Luffy
Name meaning: Direct loan of the real-world Icelandic dish *hákarl* — the national dish of Iceland: Greenland-shark (sleeper-shark) meat that is gutted, buried/fermented for weeks then hung to cure for months. The Icelandic word *hákarl* literally just means 'shark' (full name *kæstur hákarl* = 'fermented shark'). The Greenland shark's fresh flesh is poisonous (high urea / trimethylamine oxide), so the curing both detoxifies it and gives it a notorious ammonia reek — which is why the manga gag is faithful: the giants' ration makes Luffy retch ('blergh! what's that smell?!') yet 'tastes good when you're used to it.' Functions as a thematic anchor for Elbaf's Norse / Viking coding: hákarl is the quintessential Old-Norse survival/preservation food, traditionally eaten at Iceland's midwinter pagan feast Þorrablót — exactly the warrior-survival 'emergency rations' register the chapter gives it for the giants of Elbaf.

Elbaf fermented-shark emergency rations — the giants’ food, named in the Egghead escape sequence Ch. 1112.

What we know

Ch. 1112: Hákarl is a fermented-shark food used as emergency rations by the giants of Elbaf (real-world Hákarl is the Icelandic cured/fermented Greenland-shark dish). When Luffy crashes out of his Gear-5/Nika form into a starved state for lack of “food power,” the Elbaf giants offer him Hákarl, which instantly re-energizes him to full strength (“nwaah!! I feel energized again!!”; “you’re back to the old you!!”).
Ch. 1112: The smell is overpowering (“blergh! what’s that smell?!”) but “tastes good when you’re used to it” — an Elbaf-cultural item likely to recur as the crew approaches Elbaf.

Culture: Elbaf · Giants
Power-mechanic tie-in: Sun God Nika (the Gear-5/Nika form’s depletable “food power” cost) · Luffy
Foreshadowing seeds about this topic: Gear Five Nika Reverts To A Starved Form When Out Of Food