During improvement works on the N11 in County Wicklow, excavation at Ballynapark uncovered a burnt mound, one of the most quietly enigmatic monument types in the Irish archaeological record. These sites, sometimes called fulachta fiadh, are essentially the debris of repeated heating and cooling: stones cracked and blackened from being used to boil water, piled up over time into low, often horseshoe-shaped mounds. They are extraordinarily common across Ireland, yet what exactly was being cooked, cleaned, or processed in them is still a matter of debate among archaeologists.

What made the Ballynapark example particularly interesting was what lay beneath the burnt material. When excavated by Goorik Dehaene, the scorched debris was found to have sealed a trough and three pits, the trough retaining poorly preserved remnants of a timber lining along its sides and traces of clay lining around its upper edge. The trough would have held water, into which heated stones were dropped to raise the temperature, a method that works faster than it sounds. A radiocarbon date obtained from the site places the feature in the early to middle Bronze Age, suggesting activity somewhere in the broad span between roughly 2200 and 1500 BC, a period when this kind of site appears repeatedly across the Irish landscape.