A fulacht fia is, in essence, an ancient cooking or processing site, typically consisting of a mound of fire-cracked stone accumulated beside a trough, where water was repeatedly heated by dropping in stones from an open fire. Thousands of them survive across Ireland, most dating to the Bronze Age, and many are now known only from chance exposures like this one.

At Lissard, burnt material was recorded in the section of a drain over a distance of roughly eight metres, enough to confirm the presence of the characteristic scorched and shattered stone that defines these sites. The mound above ground, if one ever remained prominent here, has long since been absorbed into the surrounding pasture. That gradual disappearance into farmland is a fate shared by many fulachtaí fiadh across Munster, where centuries of ploughing, drainage works, and grazing have reduced what were once low crescent-shaped mounds to little more than a dark smear in an exposed bank.