In a small saucepan, just cover raisins with water and simmer for a few minutes. Add dark rum, stir. Turn heat off.
Spray an oven-proof dish with cooking spray. Place apples into dish and sprinkle castor sugar on top.
Pour rum and raisin mixture over the top and mix. I use clean hands.
Cook in a 200C oven for 30 minutes.
To prepare the cobbler mix the flour, sugar, butter, baking powder, bi-carb soda and salt place in a food processor & blend for 30 seconds and pour into a bowl. Make a well in the centre and add vanilla essence and buttermilk. Combine.
Spray six ramekin dishes with cooking spray, divide the rum and raisin mix and top each with the cobbler mix.
Place ramekins on a tray and cook in the oven at 200C for 20 minutes or until browned.