Dessert

Preheat oven to 375°F and grease a 23cm round springform tin.
Trim the top and bottom of the orange, slice and remove all seeds
Puree the orange with its peel in a food processor
Add one third of the caster sugar and the olive oil to the puree and blend until well combined
Sieve together the flour and baking powder
Beat the eggs and the remaining caster sugar with an electric mixer until very fluffy
Fold half of the flour mixture into the beaten egg mixture
Fold in the orange puree and the vanilla extract
Fold in the remaining flour mixture until just combined
Pour the batter into the prepared tin and smooth the top
Bake at 375°F for 20 minutes, then reduce to 325°F and bake for 30 minutes or until a skewer comes out clean and the cake is golden brown.
Cool the cake on a wire rack