This month, Gastro Obscura is sharing the recipes and stories behind amazing holiday dishes and drinks in an ongoing series, Home-Cooked Holidays. Winter’s the time for hot toddies and eggnog, or any cocktail that combines fistfuls of spices with warm sweetness. But when it comes to sweetness, spice, and sheer boozy firepower, boilo has them all beat. You can be forgiven for not knowing about boilo. Outside of Pennsylvania, this warm drink, sipped by the shot, is rarely seen, and its main ingredient, Four Queens whiskey, is practically impossible to…