Thank you for that advice. I halved each of the fruits so I could inspect
it, and removed the 'navel' with a sharp pointed knife. My caution paid off,
as about 5% of the lillypillys had areas of discolouration near the seed or
had insect or grub damage. When making the jam, I boiled the seeds along
with the fruit halves, added about an equal weight of sugar, juice of a
lemon, one piece of crystallized ginger cut into tiny slivers, and a small
amount of water to thin the mix as it cooked.
The conserve turned a deep brownish red colour, and after an hour or two
the seeds were easily scooped out because they floated to the surface. The
conserve set readily, and has a taste similar to plum jam. Is delicous on
toast, and irresistible when topped with whipped cream or plain yoghurt.
I'm still open to thoughts on why there seem to be no native birds or bats
that will eat the fruit growing in suburbia.