Orange cake (Portokalopita)

This is a traditional Greek orange cake, made with filo pastry. I don't know how authentic this recipe is, even before I started altering it! I made a small one, with just one egg.

Ingredients

Cake:
filo pastry
sugar
yoghurt
1 egg
Half an orange
tsp baking powder

Syrup:
water
sugar
other half of orange

Equipment
bowl
spoon
fork
food blender
baking tray

small cake baking tin

oven to brown filo patry:
time in oven: 10 mins
oven to cook cake:
time in oven: 35-40 mins

preparation time:
hour to cook orange, then about 15 mins

Cooking process

Boil orange until soft (an hour?) Cut off top and bottom (about half the orange). Whizz in a blender until pulverised. This will go in the cake.
Make syrup by adding the sugar to the water and heating until dissolved. Cut the rest of the orange in two, then slice thinly and add to the syrup. Boil gently for 10 mins.
Measure out the correct amount of filo pastry. Separate the layers, crumple it slightly, and put in a baking tray. Bake in a cool oven (see above) until light brown. I found this took about 10 minutes, but had to check it from time to time to turn the pastry, as the bits on top went crispy, but still soft underneat. When done, crumple the pieces into bits.
Beat the egg and sugar, and then mix the rest of the ingredients in as well. Put in a small baking tin, and arrange the orange slices on top.
Put in the oven to cook for the higher temperature (see above) for about 35 to 40 mins.
When the cake is cooked, cut into pieces while still in the tin, and por the syrup over.

Other ideas

This uses about half a pack of filo pastry. You can make baklava with the other half.
The recipe I worked from put cinnamon and star anise in the candied oranges. I put some cinnamon in the cake instead.
I like candied orange, so I made it wirh two oranges, and anything left from making the cake, I just ate! I used the same weight of sugar to water. It has to cover the orange slices when boiling.