Frozen or on the rocks is for amateurs, now that W. Park Kerr is on the scene. Kerr, a ninth-generation Texan with agave in his blood, really knows his way around a margarita—as he reveals here with more than 60 recipes for his favorite tequila-kissed concoctions. Patio party or swanky soiree, the opportunities to cha-cha with Senorita Margarita are many. There is, of course, the classic, the timeless, Ultimate Margarita. Witness also the tropical Frozen Mandarina Margarita and Citrus Cantina Cooler, where unexpected fruit flavors make a splash. With rowdy gelatin shooters, potent punches, tasty tequila-friendly snacks, including an outrageous flan cake, Viva Margarita will make the most demure hostess belt out an uninhibited "Viva!"