Ingredients
165g unsalted butter
200g caster sugar
1 orange, zested
60g cornflour
4 eggs
1 tsp vanilla extract
180g plain flour
1 tsp baking powder
120g dark chocolate, melted, cooled
Method
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Preheat oven to 180ºC. Line a large loaf tin with baking paper. Put butter, sugar, zest and cornflour in the bowl of an electric mixer and beat on high for 3 minutes or until light and creamy. Add eggs and vanilla. Beat until smooth.
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Sift the flour and baking powder into the bowl and mix until smooth. Put one-third of the mixture in a medium bowl, then fold in chocolate.
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Spoon vanilla mixture into prepared tin, then add the chocolate mixture in parallel lines. Stir gently with a teaspoon to marble. Do not overmix. Bake for 15 minutes or until the skin is just set. Use a sharp knife to make a shallow slash along the top of the cake, then bake for a further 30 minutes or until a skewer inserted in the centre comes out clean. Cool completely on a wire rack. Serve.
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