Thanks Sandra. I once visited Lismore (far North-East in New South Wales for furreners) and they have a variety of custard apple that is the size of a football. Wonderful flavour too!   They don't carry it seems so they're not found far from where they are grown. Have you tried them with passionfruit squeezed over them?
And yes! Plums - greengages! We must get together one day and have a feast. Cheers, Joy