The one at Shinnagh in County Mayo is a quiet representative of a type that archaeologists have spent decades arguing over. The name, sometimes translated loosely as "cooking place of the deer," refers to a particular kind of burnt mound, typically a horseshoe-shaped heap of fire-cracked stone and dark, charred soil found near water. They date predominantly to the Bronze Age, roughly 1500 to 500 BC, though some are older, and they appear in bogs, beside streams, and in low-lying ground throughout Ireland.

The standard interpretation, associated with experimental work carried out from the 1950s onwards, holds that these sites were used for boiling water by heating stones in a fire and dropping them into a water-filled trough, often timber-lined. Meat could then be cooked in the heated water. The cracked and spent stones were discarded to the side, building up over repeated use into the characteristic mound. More recent researchers have proposed additional or alternative functions, including bathing, brewing, or textile processing, and the debate has not been fully settled. What is consistent across sites is the combination of a hearth, a trough, and a growing pile of thermally shattered stone. The Shinnagh example sits within a county that has produced a considerable number of such monuments, many of them surviving as low earthworks in marginal or boggy ground.