Applejack is a distilled alcoholic beverage.
“Applejack”. My father, USAF general, and our neighbors, nuke physicist, judge, used to make this every Autumn. They would light their shots on fire and laugh. I suspect it was because it was so lethal in its high test that burning off some of the “proof” was just self preservation. Also, because they smoked cigars, probably didn’t want permanent facial disfigurement from their breath lighting their faces on fire.