Instructions
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Preheat your oven to 190 degrees Celsius (Gas Mark 5).
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Lightly grease a 23cm round springform cake tin. Set it aside.
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Prepare the orange. Use a knife to carefully cut off the hard ends from the top and bottom of the orange.
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Slice the entire orange into small pieces. Remove any seeds you find.
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Place all orange pieces, including the peel, into a food processor.
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Blend the orange until it becomes a smooth puree.
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Add 100g of caster sugar and 75ml of olive oil to the orange puree in the food processor.
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Blend again until these ingredients are well mixed. Set aside.
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In a separate bowl, sift together 280g of flour and 1 tablespoon of baking powder. Set this aside.
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In a large mixing bowl, combine 4 large eggs and the remaining 200g of caster sugar.
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Use an electric hand mixer to beat this egg and sugar mixture for at least 5 minutes. Beat until the mixture is very light, pale, and fluffy.
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Gently fold in half of the sifted flour mixture into the egg mixture.
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Add the orange puree mixture and 2 teaspoons of vanilla extract. Gently fold them into the batter.
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Finally, fold in the remaining half of the flour mixture. Mix carefully until all ingredients are just combined. Do not overmix.
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Pour the cake batter into the greased 23cm springform tin.
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Use a spatula to gently smooth the top of the batter.
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Place the tin into the preheated oven (190°C).
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Bake for 20 minutes.
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After 20 minutes, reduce the oven temperature to 160 degrees Celsius (Gas Mark 2).
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Continue to bake for another 30 minutes.
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The cake is done when it looks golden brown and a wooden skewer inserted into the center comes out clean.
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Remove the cake from the oven.
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Let it cool completely on a wire rack before serving.