Irish doctoral student Fionnan O’Connor has been chasing ghosts. He is not pursuing the spectres of deceased warriors or poets, but rather forgotten Irish drinks. In a personal quest that has taken him from quiet university libraries to modern distilleries, he is determined to revive rare spirits made using old-fashioned methods and ingredients, specifically pot-still whiskies. As part of his Ph.D. thesis in ghost whiskeys, O’Connor is resuscitating pot-still recipes that have not been tasted for more than 100 years. These long-lost beverages could soon enliven parties across Ireland, just…