It is, in fact, the remnant of a prehistoric cooking site, known in Irish archaeology as a fulacht fiadh. The mound measures roughly nine metres from northwest to southeast and six metres across, and its unassuming profile conceals material that tells a specific story: heat-shattered stone and charcoal-enriched soil, the accumulated debris of repeated high-temperature use over what may have been centuries.

Burnt mounds of this type are among the most common prehistoric monuments in Ireland, yet they remain poorly understood in terms of their precise function and date. The typical interpretation holds that stones were heated in a fire, then dropped into a water-filled trough to bring liquid rapidly to the boil, most likely for cooking meat. The cracked and fire-fractured stones, useless after a single heating, were discarded to the side, building up over time into the distinctive low kidney-shaped or oval mounds that survive today. Most examples in Ireland date broadly to the Bronze Age, roughly 2000 to 500 BC, though some may be earlier or later. The Annakisha example carries the characteristic profile of the type, including a slight outward bulge of around two metres on the southeastern side, which may reflect the direction in which spoil was most often thrown, or the position of the trough relative to the fire.