It is not. Beneath the turf lies a spread of burnt material, the accumulated debris of a fulacht fia, one of the most common yet persistently mysterious monument types in the Irish archaeological record.

A fulacht fia, sometimes called a burnt mound, is the remains of an ancient cooking or processing site, typically consisting of fire-cracked stones discarded beside a water trough. The method, used predominantly during the Bronze Age, involved heating stones in a fire and dropping them into a water-filled pit or wooden trough to bring the water rapidly to the boil. Over repeated use, the shattered, heat-spent stones built up into a mound, often horseshoe-shaped, beside the trough. They are found in their thousands across Ireland, frequently in low-lying or waterlogged ground, which makes a south-west-facing slope with a natural rise a slightly less typical setting than usual. Whether the site at Lissanisky served strictly as a cooking place, or was used for other purposes such as textile processing or bathing, is not recorded, and the wider debate about the precise function of fulachta fia remains open among archaeologists. What is clear is that the grass-covered spread of scorched stone here represents many episodes of deliberate, repeated activity by people who understood this landscape intimately and returned to it across what may have been generations.