Having trained together at cooking schools and restaurant kitchens in New York and California, the twins now have piles of recipes to draw on and a few unusual strategies. One is to organize parties around specific drinks--margaritas, say, or martinis. Asked to plan a cocktail party at the home of designers Vasilios Kiniris and Wendy Nishimura-Kiniris (who sell everything from dinnerware to decorative lighting at their Fillmore Street shop, Zinc Details), the sisters chose Pineapple Cosmopolitans as their jumping-off point. This drink makes a great match for most hors d'oeuvres, which tend to be salty or spicy. Its slightly sweet fruitiness cuts the heat in the Paprika Chips and the Goat Cheese Quesadillas and mutes the saltiness in the Blue Cheese Straws and the Oniony Cheese Puffs. And, of course, the drink is delicious on its own.