That is what makes the site at Lyroe quietly odd: standing in rough grazing land in mid-Cork, this fulacht fia sits almost shoulder to shoulder with another of its kind. A fulacht fia is a type of prehistoric cooking or processing site, typically identified by a horseshoe-shaped mound of fire-cracked stone and charcoal left behind after repeated cycles of heating stones and dropping them into a water-filled trough to bring it to the boil. They are among the most common prehistoric monument types in Ireland, found in their thousands, and yet the function of some remains debated, with suggestions ranging from cooking meat to brewing, dyeing, or even bathing.

The mound at Lyroe is irregular in shape, measuring sixteen metres north to south and ten metres east to west, rising to roughly 0.4 metres in height. That low, spreading profile is typical of the type, the accumulated debris of burnt stone discarded over many uses. On the western side there is a depression about 2.1 metres wide, which may represent the trough area where water was heated. The proximity of a second fulacht fia just two metres to the east raises questions that the visible remains alone cannot answer: whether the two were in use simultaneously, or at different periods, or served different purposes, is not recorded in any surviving evidence. What the pairing does suggest is that this particular patch of ground in Lyroe was considered a good place to do whatever it was these sites were built to do, and that someone returned to it, or that two groups independently made the same judgement about the same landscape.