Sliders - usually three little meatballs on three little buns - are a huge hit in New York. They are also the most popular dish at Little Owl, the West Village restaurant that serves tasty Mediterranean-influenced food at affordable prices. Since the restaurant has only 32 seats, it takes forever to get a table, but it's well worth the wait. While I was there, chef Joey Campanaro was kind enough to give me the recipe for his gravy meatball sliders. Buy jars of passata (tomato purée) for the puréed tomatoes.