Grease and line a 22 cm loose-bottomed cake tin and preheat oven to 170°C (150°C fan-forced).
Beat the egg yolks and 100 g of the caster sugar until light and foamy. Add the zest, olive oil, orange juice and almond extract.
In another bowl, combine the ground almonds, salt and baking powder and mix well.
Add the dry ingredients to the egg mixture and mix it in to make the batter.
Beat the egg whites to soft peaks, then add the other 50 g caster sugar and beat well together. Fold it into the batter and pour the batter into the prepared cake tin.
Sprinkle over the flaked almonds and bake for about 35 minutes, or until cooked and golden brown.
Cool, remove from the cake tin and dust with the icing sugar.
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