Tunisian Orange Cake

1. Preheat oven to 190 C / Gas 5. Grease a 23cm round springform tin.
2. 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.
3. Sieve together flour and baking powder.
4. 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.
5. 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.
   20 minutes30 minutes

Cooking notes

Baked goods are unforgiving with rounding — use weights rather than volumes whenever possible, and verify pan capacity if you scale up or down significantly.

For volume-to-weight conversions of any ingredient — flour, sugar, butter, salts — use the ingredient converter. To translate the recipe's oven temperature between °C, °F and gas mark, see the temperature converter.

When you scale this recipe up or down, remember that cooking time does not scale linearly. A doubled cake takes longer, but not twice as long; a doubled soup takes roughly twice as long. The cooking-time guide gives sensible starting estimates by dish geometry.