They appear as low, horseshoe-shaped mounds, typically found near water, and are most commonly dated to the Bronze Age, roughly 1500 to 500 BC. The prevailing theory holds that they functioned as outdoor cooking sites: a trough dug into the ground and lined with wood or stone would be filled with water, and rocks heated in a nearby fire would then be dropped in to bring the water to a boil. The cracked and shattered stones, discarded after use, gradually accumulated into the distinctive mound shape that survives today. Some researchers have proposed alternative uses, including textile processing or bathing, though cooking remains the most widely accepted explanation.

The example at Ballygriffin, in County Kilkenny, sits within a county that contains a considerable number of such monuments, a reflection of how densely Bronze Age communities once worked and moved through this part of the country. Kilkenny's landscape, with its river valleys and well-watered lowlands, would have provided exactly the kind of environment these sites required. Ballygriffin itself is a townland in the south of the county, a quiet agricultural area where the presence of a fulacht fia is a reminder that the land was in active use long before any written record begins. Without further documentary detail currently available for this specific site, its precise dimensions, condition, and immediate setting remain unconfirmed, but its existence in the landscape places it within a tradition of Bronze Age activity that is well attested across the region.