These sites, found in their thousands across Ireland, typically appear as low, horseshoe-shaped mounds of fire-cracked stone, usually positioned close to a water source. The generally accepted interpretation is that they functioned as Bronze Age cooking sites, where water held in a timber- or stone-lined trough was brought to the boil by dropping in stones heated in a nearby fire. Whole animal carcasses could then be slowly cooked in the steaming water. Other theories propose uses ranging from textile processing to bathing, and the debate has never been fully settled.

The Bronze Age date assigned to most fulachtaí fia, broadly spanning from around 2000 to 500 BC, makes sites like this one contemporaries of the great megalithic traditions elsewhere in Europe, though they are considerably more modest in appearance. Their very modesty is part of what makes them interesting: these were not ceremonial monuments but working features of daily or seasonal life, the kind of archaeology that accumulates quietly at the edge of fields and boggy ground rather than on hilltops and ridgelines. Doughiska itself sits in an area that has seen considerable suburban expansion in recent decades, which gives this particular survival an added significance as a physical trace of activity stretching back several millennia beneath what is now a heavily developed corridor between Galway city and its eastern hinterland.