Grease the oven-proof dish and arrange the apples on the bottom. Sprinkle over the brown sugar and the lemon zest and juice.
Put the baking spread, sugar, eggs, flour, and baking powder in a large bowl and beat until smooth. Spoon on top of the apples, and level out with the back of a tablespoon.
Bake in a preheated oven at 160°cfan/180°c/Gas 4 for 45 minutes until it is golden and springy to touch. Serve hot with custard or cream!
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