Mystery Tree ID (zone 10)- help if you can, please

Hi,
this tree was given to me by a local plantsman who specialized in the unusual. Unfortunately, I lost the tag and he has passed away. If anyone recognizes it, I'd be grateful to know.

Thanks!

Does the fruit have a seed or seeds? seeing the inside of the fruit might give a clue.

The fruit/leaves look like pomegranate to me.

yes, please show the bottom of the fruit (is it just that little beaky bit, or is there something remaining from the flower?). if there were any flowers (if you can remember what they looked like) that would be helpful.

Thanks so much for taking your time to reply. The flowers must be unremarkable because I've never noticed them. The mature fruit is in the picture with the pear-shaped double fruit. I did not open them up to see seeds, and I didn't get a picture of the bottom of the fruit, sorry. It is definitely not a pomegranate– those leaves are not so smooth and pointy. It is also not a Miracle fruit.
Thanks!

Guava?

Not Guava.Thanks for trying!

I'm in Brazil where a lot of these funky fruits seem to come from.
Looking at the fruit, there is something called the peanut butter fruit (Bunchosia armeniaca), but to me the leaves look different, generally they're bigger. have a search online and see what I mean.

The body of your tree looks for all the world like a pitanga (surinam cherry) but the fruit are definitely not.

Another fruit tree from this area with very similar leaves is Eugenia hiemalis, but the fruit have a little calyx kind of thing on the bottom. The fruit are supposed to be brown to black, but I'm not sure what color they are when they aren't quite ripe, if they are red at any point. The fruit shape seems right. They are used in traditional medicine and are apparently quite bitter.

I'm in zone 9b and these fruit are both way too tender for the frost we just got.

PS it might help to know how big the fruit are. I'm making assumptions about leaf size when I truly don't know how big leaves or fruit are!

Hi,
Thanks!
the fruit is about an inch or so long. It isn't either of those trees, I can tell!

I appreciate the effort!

Solved!

Meiogyne cylindrocarpa (Native Apricot)

https://www.territorynativeplants.com.au/meiogyne-cylindrocarpa-native-apricot