What lies beneath the surface, however, is the residue of a cooking method that was repeated across the Irish landscape for roughly two thousand years during the Bronze Age. This particular spread of burnt and shattered stone measures approximately thirteen metres by thirteen metres, a modest but telling footprint.

A fulacht fia, the term used for these prehistoric cooking sites, typically consists of a horseshoe-shaped mound of fire-cracked stone accumulated beside a trough, usually timber-lined, which would have been filled with water. Stones were heated in a fire and dropped into the trough until the water boiled, allowing meat to be cooked. The broken, heat-shattered stones were discarded to the side, and over centuries these waste heaps built up into the mounded forms that survive today. The site at Rathnagard sits roughly sixty-five metres north of a stream, which is consistent with the pattern seen at hundreds of similar sites across Ireland; proximity to a reliable water source was essential to the whole process. The faint spread of dark, burnt material beneath the grass is what remains of that accumulated debris, preserved in the soil long after the people who used it have left no other trace here.