Preheat the oven to 200°C/gas6. Grease a shallow ovenproof dish (1.5l capacity). Arrange the plums in the dish, spreading them in an even layer. Place in the oven for 5 minutes so the dish will be hot when you come to pour the batter (important!).
Sift the flour into a bowl and add the sugar. Mix the coconut milk, milk, eggs and vanilla. Whisk into the flour mixture to make a smooth batter. I usually just throw it all in a belnder & whizz until I have a smooth batter!
Pour the batter over the fruit. Bake for 20 - 25 minutes or until set and golden in colour.
Scatter the dessicated coconut over the top and serve straight away with whatever you fancy (see my ideas above).