Growing up, my parents used to have dinner parties two or three times a year. One regular attendee, Monsignor Nolan, was a gourmand and, on more than one occasion, would don my mother's apron and cook his version of Potatoes O'Brien in her kitchen! One of my younger brothers couldn't pronounce the word "monsignor," and "monsidene" was as close as he got! So we dubbed these "Potatoes Monsidene." The bacon fat and fresh parsley really give this dish a great flavor!