This is a fulacht fia, a type of Bronze Age cooking site found in extraordinary numbers across Ireland, and one of the most common yet least remarked-upon monuments in the Irish countryside. The basic principle involved heating stones in a fire, dropping them into a water-filled trough to bring it to the boil, and using that heat to cook meat. The cracked, fire-spent stones were then raked aside, building up over time into the horseshoe-shaped mounds that survive today.

The Lisladeen example rises only about 0.3 metres above the surrounding ground, a modest accumulation that nonetheless represents repeated use over what may have been centuries. A drainage channel runs along its northern edge, a practical detail that speaks to whoever managed this site, keeping standing water from swamping the working area. The choice of location was entirely deliberate: fulachtaí fia are almost always found near water, since a reliable source was essential to the whole operation, and marshy or low-lying ground was often preferred precisely because it held moisture well.