The term, loosely translated from Irish, refers to ancient cooking or boiling sites, typically identified today as a horseshoe-shaped mound of burnt and shattered stone beside a trough cut into the ground. The accepted theory is that water in the trough was brought to the boil by dropping fire-heated stones into it, the stones cracking in the process and eventually accumulating into the distinctive mound. Most date to the Bronze Age, roughly 1500 to 500 BC, though some examples have been dated earlier or later. One such site sits in the townland of Killaspy in County Kilkenny, a quiet mark in the landscape that points to activity here well over two thousand years ago.

Killaspy is a rural townland in the Irish midlands fringe of Kilkenny, and the presence of a fulacht fia there places it within a pattern seen across the province of Leinster, where low-lying, waterlogged ground near streams provided ideal conditions for this kind of site. The proximity to a reliable water source was not incidental; it was essential to how these places functioned. Beyond the location itself, the specific details of this particular site, its dimensions, its condition, any associated finds or features, are not currently available in the public record.