HOMEMADE JAFFA CAKES

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Ingredients
For the jelly
1 x 135g packet orange jelly
150ml/5fl oz boiling water
1 small orange, finely grated zest only
For the sponge
unsalted butter, for greasing
1 large free-range egg
25g/1oz caster sugar
25g/1oz self-raising flour, sifted
For the topping
180g/6¼oz plain chocolate (about 36% cocoa solids)