On a slope above the River Suir in County Waterford, a patch of earth conceals the fractured, fire-blackened stones of a prehistoric cooking site, the kind of place that only revealed itself because a gas company needed to lay a pipeline. Burnt mounds, known in Irish archaeology as fulachtaí fia, are among the most common prehistoric monument types in Ireland, yet they remain genuinely mysterious. The leading theory holds that they were cooking sites, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil, with the cracked and spent stones gradually accumulating into a mound. Some researchers have proposed alternative uses, from textile processing to bathing, but the cooking interpretation remains the most widely accepted.

This particular example at Brownswood sits towards the bottom of a northeast-facing slope, on a shelf of ground that looks out over the River Suir as it runs on a northwest to southeast axis below. In 1986, when Bord Gáis was cutting a pipeline corridor through the area, fieldwork by M. Gowen recorded a spread of broken and burnt stone measuring approximately 13.5 metres by 9.7 metres. That is a substantial footprint for what was exposed, but the picture is almost certainly incomplete. The visible spread represents only the portion that fell within the pipeline corridor, and it is thought that the greater part of the mound continues to the west, undisturbed beneath the surface.