Beneath what is now a garden on a gentle north-facing slope, the ground once held a fulacht fia, one of the thousands of prehistoric cooking sites found across Ireland, typically identified by their characteristic horseshoe-shaped mounds of fire-cracked stone. This one survives only in the archaeological record, its physical presence erased long before anyone thought to document it properly.

The site came to light in 1974, when development work disturbed the ground and exposed burnt material along with a plank-built trough. A wooden trough is a significant find in this context; fulachtaí fia are generally understood to have functioned by heating stones in a fire and dropping them into a water-filled trough to bring the water to a boil, a method used for cooking, and possibly for other purposes such as textile preparation or bathing. The plank-built construction at Rath More suggests a degree of deliberate engineering rather than a simple pit. Local information at the time of discovery indicated that a small, low mound had existed on the site before it was levelled, which fits the typical profile of these monuments. The discovery was recorded by Ryan in 1976, though by that point the physical remains had already been lost to the development that uncovered them in the first place.