Cristina's deli case overflows with a tantalizing assortment of hot and cold entrees, salads and appetizers made daily, along with imported and domestic Italian cheeses, salamis, and olives. For more than a few people in Sun Valley, Cristina's deli is the source of daily lunches and dinners, not to mention hors d'oeuvres for parties . . . even dinner for house guests or neighbors.