It rises only twenty to thirty centimetres above the ground and stretches roughly nine metres east to west and four metres north to south. To a passing eye it might mean nothing at all, but it is almost certainly the remnant of a fulacht fia, a type of ancient outdoor cooking site found in great numbers across Ireland and dating typically to the Bronze Age. The characteristic feature of these sites is a mound of fire-cracked and burnt stone, the discarded debris of repeated heating. The usual method involved heating stones in a fire and dropping them into a water-filled trough to bring it to a boil, likely for cooking meat, though scholars have proposed other uses over the years, including textile processing and bathing.

What survives at Garrigane is the burnt mound itself, the accumulated waste material from that repeated process. The southern end of the mound has been cut into by a field drain at some point, removing a portion of the original spread of material. The rest remains in place, sitting three metres north of that drain, slowly eroding into the tillage around it. It is an unassuming trace of activity that may be three or four thousand years old, left in a landscape that has otherwise been thoroughly reshaped by farming.