Mulberry and Walnut Baklava Rolls

Delicious and sweet pastry rolls filled with mulberries and walnuts.

1.	Preheat your oven to 180°C (350°F).
2.	In a bowl, combine the chopped walnuts, sugar, cinnamon, and vanilla extract.
3.	Lay out one sheet of filo pastry on a clean surface and brush it with melted butter.
4.	Place another sheet of filo pastry on top and brush it with butter as well.
5.	Repeat this process with the rest of the filo pastry sheets, stacking them on top of each other and brushing each one with butter.
6.	Spread the mulberries evenly along the length of the stacked filo pastry sheets.
7.	Sprinkle the walnut mixture over the mulberries.
8.	Starting from one of the long edges, roll up the filo pastry tightly to form a long roll.
9.	Place the roll on a baking sheet lined with parchment paper.
10.	Bake in the preheated oven for 30 minutes, or until the pastry is golden brown and crispy.
11.	While the baklava rolls are baking, prepare the syrup by combining the sugar, water, and lemon juice in a saucepan.
12.	Bring the mixture to a boil and let it simmer for 5 minutes, until the sugar is dissolved and the syrup has thickened slightly.
13.	Remove the baklava rolls from the oven and immediately pour the hot syrup over them.
14.	Allow the rolls to cool completely before serving.