What is an Irish Red Ale? By the 18th century, Kilkenny was established as the brewing mecca in Ireland, as producing beer had become a commercially viable industry. Despite its commercial success, Irish brewers were constantly struggling financially and were forced to rely on their own ingenuity to lower production costs. In making stouts, brewers opted to use unmalted roasted barley over expensive black patent malt, giving the beer style its signature dry Irish character. Similarly, Irish brewers also offered their own interpretation on an English Bitter, popular in the mid-late 19th century, using unmalted roasted barley in place of …