What survives is a levelled spread of burnt material in poorly drained pasture, the flattened remnant of a fulacht fia. The term refers to a type of prehistoric cooking site found in extraordinary numbers across Ireland, typically identified by a mound of heat-shattered stone and charcoal left behind after repeated episodes of fire-setting and water-heating. The basic method involved heating stones in a fire and dropping them into a water-filled trough until the water boiled; the cracked and spent stones were then raked aside, accumulating over time into the horseshoe-shaped mounds that survive at better-preserved sites. At Lisheen, that mound has been levelled, leaving only the scorched spread in the ground.

Fulachtaí fia are among the most common archaeological monument types in Ireland, with thousands recorded across the country, and Cork is particularly well-represented. They date predominantly to the Bronze Age, roughly between 1500 and 500 BC, though some examples have been associated with earlier or later activity. Their precise function has been debated at length; cooking is the most widely accepted explanation, but brewing, textile processing, and bathing have all been proposed based on experimental archaeology and contextual evidence. The preference for poorly drained, low-lying ground, as at Lisheen, is characteristic of the type; the sites cluster near natural water sources or in areas where groundwater was reliably close to the surface, which made filling a trough straightforward.