Begin by drying the filo pastry in the oven.
In a bowl, combine the dried filo pastry with Greek yogurt, eggs, and a splash of orange juice to form a smooth batter.
While the cake is baking, prepare the orange syrup using the leftover orange peel and a cinnamon stick.
Heat the syrup mixture until it is warm.
Once the cake is baked, pour the warm syrup over it and let it soak in.
