The one at Ballygarriff in County Mayo is, on the face of it, unremarkable in type, yet its very ordinariness is part of what makes it worth pausing over. These are Bronze Age cooking sites, typically found near water, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The evidence left behind is a horseshoe-shaped mound of fire-cracked, shattered stone, blackened and discarded after each use, built up over repeated visits across what may have been generations.

The term fulacht fia translates loosely from the Irish as something like "cooking pit of the deer," though whether they were used primarily for hunting parties, communal gatherings, or even industrial processes such as textile preparation remains a matter of debate among archaeologists. What is consistent across the hundreds of excavated examples is the pattern: a timber-lined trough, a hearth nearby, and that distinctive spreads of burnt stone forming the mound that survives long after everything organic has rotted away. The Ballygarriff example sits within a landscape of Mayo that contains numerous prehistoric monuments, reflecting a period, roughly 1500 to 500 BC, when this part of the west of Ireland was considerably more densely settled and farmed than the boggy terrain might now suggest.