That contrast is itself a clue. The mound, measuring roughly 11.5 metres by 8.3 metres and rising only about 25 centimetres above the ground, is composed almost entirely of burnt stone and charcoal, the accumulated debris of a fulacht fia, an ancient outdoor cooking site. These features are among the most common prehistoric monuments in Ireland, typically found near water, and the working theory is that stones were heated in fire and then dropped into a water-filled trough to bring it to a boil, cooking meat wrapped in straw or skins. The mound is what remains after generations of cracked and discarded stones were thrown aside. The opening of this one, around 4 metres wide, faces south-southwest.

What makes Meenroe quietly notable is not this mound alone but the fact that a second fulacht fia lies roughly 50 metres to the south-east. Finding two within such close proximity raises the kind of questions that rarely get tidy answers: whether they were in use at the same time, whether they served the same community, or whether one simply fell out of use and another was established nearby. The marshy setting is entirely typical of the monument type, since a reliable water source was essential to the whole process, and the slight elevation of the mound above the surrounding wetland has helped preserve it, keeping the burnt material dry beneath its grass cover.