Baklava filling ingredients vary by country and region. For example, in Turkey, baklava can be made with pistachios, walnuts or almonds. But in the Black Sea region, hazelnuts are the preferred filling. Persians enjoy a drier, lighter version of baklava made from chopped almonds and pistachios and flavored with rose water.  Class Greek baklava uses walnuts and lots of the honey syrup, making it wetter and sweeter than other versions.