I know its richness makes it a naughty pleasure, but I adore commercial eggnog with its flavors of nutmeg and spirit extracts. Oh, the consistency!—creamy and smooth. Here is a bread in which eggnog contributes the essence of the holiday season to every bite. Since different brands of eggnog have different viscosities, be prepared to add another tablespoon or so here if yours is especially thick. This loaf is wonderful for toast and great for bread pudding. You can also glaze it with an