Whiskey Butterscotch Sauce

"Store-bought butterscotch sauce is often gluey and cloyingly sweet. It usually tastes of little more than artificial caramel. Real homemade butterscotch sauce, on the other hand, is a marvelous combination of flavors including brown sugar, butter, salt, and whiskey. The best part? It takes less than thirty minutes to make and all you need is a pot, a wooden spoon, and some jars. It goes without saying that this is fantastic over ice cream, but try it with bread pudding, waffles, and pancakes, too. A jar makes a great gift for St. Patrick’s Day...."