These are the horseshoe-shaped mounds of burnt and shattered stone that appear in their thousands across the Irish landscape, almost always beside a stream or boggy hollow, and almost always dating to the Bronze Age. The name, loosely translated from Irish, means something like "deer roast" or "wild cooking place", and the leading theory holds that they functioned as outdoor cooking sites, where stones were heated in fire, then dropped into a water-filled trough to bring it to a boil. The mounds themselves are simply the accumulated debris of that process, cracked stones discarded after repeated heating and cooling over many generations of use.

The mechanics are well understood in general terms, but the specific story of the Killadysert example remains largely unrecorded in publicly available sources. What can be said is that Killadysert parish sits in an area of west Clare that would have been well settled during the Bronze Age, and the presence of a fulacht fia here fits a broader pattern across the region. The monument's proximity to the estuary and the low-lying, water-retentive ground that characterises much of this stretch of Clare would have made it a practical location for the kind of activity these sites represent. Whether it was used seasonally, or by a settled community nearby, is the sort of question that only targeted excavation tends to resolve.