It's testament to an eatery's excellence when the place can stay open only five or so hours a day, yet hold a place among a city's most-loved nosh spots. Such is the case at the family-run Adriana's, where loyalists lunch on Sicilian specialties like eggplant caponata, mostaccioli and salsiccia sandwiches. Those sandwiches are oversize, so plan to pack up half a lunch for the next day, or take advantage of the half-sandwich combos (with soup or salad). Some folks call Adriana's a no-frills joint because there's no table service, the tablecloths are vinyl, and the prices are low. But really, the frills are in the food, abundant and delicious.