Knish

A knish /kəˈnɪʃ/ or /knɪʃ/ is a traditional Ashkenazi Jewish snack food consisting of a filling covered with dough that is typically baked or sometimes deep fried. Knishes are often purchased from street vendors in urban areas with a large Jewish population, sometimes at a hot dog stand, or from a butcher shop. They are still strongly associated with New York City cuisine. Knishes were popularized in North America by Ashkenazi Jewish refugees from the Pale of Settlement . In most traditional versions, the filling is made entirely of mashed potato, kasha (buckwheat groats), or cheese. Other varieties of fillings include beef, chicken, sweet potatoes, black beans, or spinach.

Source: Wikipedia