Some like it hot, but during the dog days of August, most of us like it cold. At this time of year, the icy cold of ice cream, America's year-round favorite, is more welcome than ever. Just in the nick of time, two new cookbooks have arrived to widen our ice cream horizons. The Ice Cream ∧ Frozen Yogurt Cookbook by Mable and Gar Hoffman has more than 220 recipes for making all manner of frozen desserts from scratch, from classic extra-rich, dark Fudge Ice Cream to an unusual Pear-and-Port Frozen Yogurt. You'll find sherbets, sorbets, granitas and gelati as well, all with easy-to-follow instructions and serving and storage tips.