Pacific horror stories, you say?
Funny you mention Fiji :^)
Fiji is an island rather isolated from the other pacific islands. It was so far away that the first people that sailed to this island ran out of food on their boat, and had to resort to cannibalism. :^)
Once they bumped into the island they noticed that there was no source of red meat anywhere, so their cannibalism continued.
Because humans tend to be more sympathetic to their own species than animals, a human would need to dehumanize another human if he would want to eat them. Cannibalism always has to have rituals to dehumanize the victim. It's also why the victims were often referred to as "long pig" (puaka balava) or "big fish" (ikalevu)
When people think of cannibalism they think of a cartoonish image of a missionary being out in a boiling pot with some vegetables, but it's far, FAR, more atrocious and disturbing than that :^)
One ritual was tying up a victim to a pole, and putting a fishhook through their tongue. They would then pull the tongue forward and cut it off, so they knew they cut off the entire tongue.
The tongue was then grilled on a fire and eaten in front of the victim, while his tormentors mocked and humiliated him. :^)
Then, they would tear off one of his arms, grill it, and eat it in front of him, in the same fashion.
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