Instructions

• Preheat oven to 190 C / Gas 5
• Grease a 23cm round springform tin
• Cut off the hard bits from the top and bottom of the orange
• Slice the orange and remove all seeds
• Puree the orange with its peel in a food processor
• Add one third of the sugar and the olive oil and continue to mix until well combined
• Sieve together flour and baking powder
• Beat the eggs and the remaining sugar with an electric hand mixer for at least five minutes until very fluffy
• Fold in half of the flour mixture, then the orange and the vanilla, then fold in the remaining flour
• Mix well but not for too long
• Pour cake mixture into prepared tin and smooth out
• Bake in preheated oven for 20 minutes
• Reduce the oven temperature to 160 C / Gas 2 and bake again for 30 minutes Bake until the cake is golden brown and a skewer comes out clean
• Cool on a wire cake rack