Tucked in a nondescript storefront on Olive Street downtown, this New York-style deli may not look like much from the outside. Inside, it's another matter: Owner Jack Carl serves up the best corned-beef and pastrami sandwiches in town, along with slaw and potato salad, matzo-ball soup and other deli staples. He also dishes up wisecracks: "Is that your daughter?" he asks a fortyish man with his wife. No to the soup? "Cheapskate!" he'll cry in feigned disgust. It's all in good fun, and this deli's many regulars know what a gem the place is.