Reduce oven temperature to 175°C.
In the large mixing bowl of a stand mixer combine the eggs and the sugar and beat for 3 - 4 minutes, until pale yellow. Add the orange zest, Greek yoghurt, vanilla extract, baking powder, bicarbonate of soda and salt, and mix until just combined.
Add the oil and the orange juice, and mix with a spatula to combine everything.
Add the dried up filo to the bowl, two handfuls at a time, and fold in using the spatula . Do not add all at once or it’ll clump together.
Pour the mixture into a greased baking tin (23cm x 33cm).Slice the last orange (leave the peel on) and arrange on the surface of the cake. Bake for 50-60 minutes in the middle of your oven until a nice golden colour.
Once baked, immediately pierce it in several places with a skewer and pour your cooled syrup onto the hot cake, one ladle at a time. Allow the syrup to be absorbed before adding the next one. Repeat until all of the syrup has been used.
Cool for 2-3 hours before cutting, to allow the syrup to be fully absorbed.
Shiri Kraus is co-owner and chef at The Black Cow Camden