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By Anna Jones
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Preheat the oven to 200°C/400°F/gas 6.
Whisk the egg and sugar with an electric hand whisk until thick and creamy. Sift in the flour and stir in.
Grease a 12-hole jam tart tin and put 1 tablespoon of mixture in each hole.
Bake in the oven for about 10 minutes, until golden brown, then remove to a wire rack to cool.
Once cool, cut the cakes in half horizontally, so you have 2 thin cakes.
Gently heat the marmalade in a saucepan for a few minutes, until it has thickened but is still spreadable. Sift to remove any peel, if you want a smooth centre. Allow to cool, then spoon a dollop of marmalade onto the centre of each cake.
Chop the chocolate and melt with the oil (if using) and 1 tablespoon of water in a heatproof bowl over a pan of boiling water. Grate in the orange zest, stirring well. Cool until the chocolate starts to thicken, and spoon over the marmalade-topped cakes. Leave to set.