My own plums are not quite ready to be picked, so I bought some last week.... and discovered they are no better than the ones on my tree. I've left them to ripen, and some have, but many have not.
So I've treated them thus:
Turn oven griller on.
Cut plums in half, remove stones, place in shallow ovenproof dish cut side up, spoon brandy over, and sprinkle generously with raw sugar.
Place under grill for about 5 minutes, or until sugar is colouring and they feel tender when poked in the side with your finger. Turn oven off and allow plums to cool in the oven for half an hour or so.
Delicious with cream, or yoghurt, or breakfast cereal!