Over the weekend I made this ridiculously easy but very scrumptious pudding when we had a barbeque with friends. I just halved and de-stoned some ripe peaches (easily done by running a sharp knife all around the middle of the peach, then twisting the halves in opposite directions to prise them apart, then just digging out the stone with a spoon), sprinkled on some sugar, wrapped them in little foil parcels, and put them on the barbeque. They took around 25 minutes to heat through and soften and I served them with a choice of mascarpone cheese or extra thick double cream.
Although we put these on the barbeque you could just as easily bake them in the oven. I reckon 20 minutes at about 200c should do it.