With the arrival of the cold-and-cough season, you may be thinking about cooking up a big batch of chicken soup as a cure for what ails us. I love the stuff, too, but I suggest you stock up on some fresh gingerroot instead. Ginger, of course, is one of the many flavors to be found in a stir-fry Asian dish or Indian curry. But used in larger quantities than specified for those recipes, it can become quite spicy. Of all the home remedies out there, I have found tea, prepared with fresh ginger, to be the most . . .