If the pastry is frozen, remove it from the freezer and let it thaw in the refrigerator. Do not leave it on the counter to thaw.
Squeeze out the excess water from the spinach by pressing it with a wooden spoon or your hands in a colander, or by wrapping it in a tea towel or paper towels. Move the spinach to a bowl.
Combine the rest of the Filling ingredients and mix well.
Cut each pastry into 3 rectangles on a work surface. Then, slice each rectangle diagonally to get 6 pieces per pastry. 18 in total
Brush the edge of each pastry with egg, then spread the filling evenly over them. Roll up the pastries from one end to the other, making sure the seam is on the bottom.
While the oven is heating up to 180C/350F, put the mixture in the fridge for 15 minutes.
Spray 2 x baking trays with oil.
To give them a golden appearance, brush the tops with egg and then sprinkle sesame seeds (white or black) over them.
After baking for 25 minutes, remove the top tray and switch the bottom tray to the upper rack. Continue baking for another 5 to 10 minutes until the crust is golden.
Best served warm