These sites, found in their thousands across the Irish landscape, are broadly interpreted as ancient cooking places, though some researchers have proposed alternative uses including brewing, dyeing, or bathing. The typical arrangement involves a trough dug into the ground, a hearth for heating stones, and a mound of the discarded burnt and shattered rock that accumulates over repeated use. It is that characteristic mound, or in this case the spread of fire-cracked material, that survives and identifies such sites to the trained eye.

Fulachtaí fia are generally associated with the Bronze Age, roughly 2000 to 500 BC, though some examples have produced dates ranging outside that period. The name itself is an early Irish term, loosely translating as something like "cooking place of the deer," though the connection to wild game is debated. At Ballynattin, what remains visible is modest: a spread of the burnt stone and charcoal-flecked earth that accumulates when fire-heated rocks are repeatedly dropped into water to bring it to the boil. The fact that it survives at all in a reclaimed agricultural field speaks to the durability of these deposits, which tend to resist disturbance simply through sheer volume of material.