So formal human sacrifices were frequent. Prisoners of war or slain enemies were often offered. The sacrificial victims too were sometimes taken from a distant tribe and when war and  violence failed to supply the demand, some- times the human lambs had to be negotiated.  Regardless of the way the human sacrifice  was obtained, the victim was often fed and fattened to make him fl eshier.  “Then tightly bound…they were placed on  hot stones in one of the usual ovens and being covered over with leaves and earth were  roasted alive while the spectators roared with laughter…”

https://www.fijitimes.com.fj/oracles-possessed-priests-and-human-sacrifices-in-old-fiji/