Halve all the stone fruits and remove the stones. Cut the plums into quarters and the peaches into eighths. Core the apples and cut each half into six segments.
Put the fruit into a shallow ovenproof dish and add all the other ingredients.
Bake for 50 minutes in an oven preheated to 170 C, 160 Fan, Gas 3 stirring a couple of times. Cool before serving.