Pre-heat the oven to 180C.
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Line an standard 20 – 23cm round cake pan with baking paper and lightly grease with butter or spray with oil.
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Zest and juice the lemon and set the zest aside. Put the chopped apples in a small bowl and pour the lemon juice over them.
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Combine the flour, sugar and lemon zest together in a large bowl, then add the eggs, melted butter, cinnamon & pine nuts (if using) and 2/3 of the apples. Stir until just combined.
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Tip the batter into the cake pan and smooth on top, then arrange the rest of the sliced apples on the top in a circular pattern. Sprinkle over the rest of the pine nuts .
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Bake for about 1 hour, or until a skewer pushed into the centre of the cake comes out clean.
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Cool completely before taking out of the tin, then sprinkle with a bit of icing sugar before serving.