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Make sure the campfire has died down but the embers are still good and hot.
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Whisk the butter and sugar together until white and fluffy then fold in the egg and sugar.
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Cut the tops off of the oranges about 1/5 of the way down - KEEP the lids!
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Scoop out the insides of the oranges with a spoon and either eat or discard.
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fill the oranges with the sponge mixture, leaving a bit of room for the cake to rise.
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Put the lid back on the orange and wrap up in a double layer of tinfoil.
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Bake in the embers of the fire for about 15-20mins until the cake is cooked.
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Eat out of the orange with a spoon - it might be an idea to let them cool a bit - especially if you're giving them to kids!