The poppy seed roll is a pastry consisting of a roll of sweet yeast bread (a viennoiserie) with a dense, rich, bittersweet filling of poppy seed. an alternative filling is a paste of minced walnuts, or minced chestnuts. it is popular in central europe and parts of eastern europe, where it is commonly eaten at christmas and easter time. it is traditional in several cuisines, including polish (makowiec), kashubian (makówc), hungarian (mákos bejgli), slovak (makovník), czech (makový závin), austrian (mohnstrudel or mohnstriezel), ukrainian (pyrih z makom пирiг з маком or makivnyk маківник), belarusian (makavy rulet макавы рулет), bosnian, croatian and serbian (makovnjača or štrudla sa makom...

Source: Wikipedia