But the site at Barnakyle, County Limerick, turned out to conceal something considerably more layered than a simple prehistoric rubbish heap when it was uncovered during road construction works in the late 1990s. What emerged was a fulacht fia, a type of ancient cooking site found across Ireland, typically consisting of a horseshoe-shaped mound of fire-cracked stones beside a water trough, where rocks heated in a fire were dropped into water to bring it to boiling point. Barnakyle proved to be an unusually well-preserved example, and one with a more complicated biography than most.

The site came to light during archaeological monitoring associated with the N20/N21 Limerick Bypass road scheme, and was excavated in 1999 by archaeologist Ciara MacManus under licence number 99E0067. Excavation revealed three distinct phases of use. The earliest saw at least one, possibly two, elongated troughs cut into the subsoil, the larger measuring just over two metres long and nearly half a metre deep, both filled with charcoal-rich peaty material and burnt stones, the classic residue of repeated heating and quenching. A second phase brought a more substantial intervention: a formal stone hearth, 2.6 metres long and 1.86 metres wide, built from limestone slabs, some set upright, some laid flat, the whole structure divided lengthways by stones set on their sides. The main slabs were badly heat-shattered, suggesting prolonged and intensive use. Alongside this hearth, a much larger secondary trough was cut into the west edge of the mound, nearly five metres long and almost a metre deep, its edges lined with small stones. The third and final phase is the most intriguing: a beehive-shaped well, constructed from roughly hewn limestone blocks in the drystone technique, meaning without mortar, was sunk into the north-eastern end of the accumulated mound, suggesting the site continued to serve some practical function long after the cooking activity had ended.

Because the site was identified and excavated as part of a road scheme, it no longer exists in situ in any accessible form; the findings are recorded in the excavations.ie database under 1999, No. 490. For anyone interested in fulachta fia more broadly, the excavation report is a useful point of entry, offering a rare chance to see how these sites actually accumulated over time rather than representing a single moment of use. The Barnakyle example is a reminder that what can appear to be a simple prehistoric mound often rewards closer attention.