Cocktails Are Back and their new incarnations make more sophisticated sipping than ever before. These updated classics from the country s most popular chefs and bartenders are simple to concoct yet complex in character and flavor. Here s how to stir up new, exciting tastes with finesse. Cheers! White Peach Sangria and Pomegranate Sangria --chef Bobby Flay The Cajun Martini --chef Paul Prudhomme The Citrus Cooler --Paul Bolles-Beaven, Union Square Cafe The Rumbo Jam --Katy Keck, New World Grill