These horseshoe-shaped mounds, typically found near water, are the remains of ancient cooking sites, where stones were heated in fire and dropped into a water-filled trough until the liquid boiled. The process left behind cracked, heat-shattered stone piled into the low humped forms that survive today. One such site lies at Cragroe in County Clare, a quiet addition to a class of monument that appears in virtually every county, yet rarely draws much attention.

The broader phenomenon of fulachtaí fia belongs mostly to the Bronze Age, roughly 1500 to 500 BC, though some sites have produced earlier or later dates. The name itself is an Irish term meaning something close to "cooking place of the wild," and while the cooking interpretation is widely accepted, researchers have also proposed uses ranging from dyeing cloth to brewing. The Cragroe example sits within a part of County Clare that has a reasonable density of prehistoric activity, the wider landscape shaped over millennia before any written record began.