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["Preheat oven to 180u00b0C/360u00b0F or Gas mark 4.", "Grease & line a rectangular baking tray - approx 9"" x 7"" or 27 cms x 20 cms.", "Peel, core & thinly slice apples; squeeze the lemon juice over them to stop them discolouring and set them to one side.", "Place butter, caster sugar, eggs, vanilla extract, flour & baking powder into a large roomy mixing bowl & mix well until smooth. You can use an electric hand whisk if it's easier.", "Spread half of the cake/pudding mixture into the prepared tin. Arrange half of the apples over the top of the mixture.", "Repeat the layer with the remaining half of cake/pudding mixture & apples - the apples should be arranged over the top of the cake/pudding mixture.", "Sprinkle over with the demerara sugar.", "Bake for 45-50 minutes until golden brown, well risen & springy to the touch.", "Leave to cool slightly for 10 minutes & then cut into squares or bars.", "Wait until the cake has completely cooled before removing the cake & the baking paper from the tin - store in an airtight tin or container.", "If you wish to serve this warm as a pudding, wait 5-10 minutes and then cut and serve with cream, custard or ice cream.", "It can also be microwaved too, for a future hot pudding!"]