Preheat the oven to 200C/400F/Gas 6.
For the caramelised plums, heat the sugar and water in a saucepan over a gentle heat until dissolved and bubbling. Boil for 8-10 minutes, or until the sugar has melted and formed a dark caramel.
Add the plums to the mixture and stir until completely coated in the caramel. Transfer the mixture to a small ovenproof dish.
For the muffin, cream the butter and sugar together in a bowl until pale and fluffy, then gradually beat in the eggs. Fold in the flour, adding a splash of milk, if necessary, to loosen the mixture.
Spoon the muffin batter onto the caramelised plums and bake in the oven for 20-25 minutes, or until the muffin has risen and is golden-brown and a skewer inserted into the muffin comes out clean.
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