We're not deep enough into Top Chef Vegas to hand one cheftestant the title of most entertaining. That will come in time. But we can still reliably count on Fabio Viviani, last season's fan favorite — who just came out with the Café Firenze Cookbook: Food and Drink Recipes From the Tuscan Sons ($19.79). "People who read it already, they need diapers. They pee themselves," Viviani has said of his cookbook.