[John J]

Here's an easy one for you. It's obviously a myrtle. Isn't it?

[David Bracey]

The nearest I can get is Feijoa but the leaves are not correct.  What about a baby Jujuba?

[pamela]

Psidium guineense   

[John J]

Sorry, David, although the Feijoa (Acca) does have a tentative connection via its common name.
Pamela, so close, would you like to try again?

[Alice]

Psidium guajava (guava)?

[oron peri]

It is a Strawberry Guava,
 Psidium cattleianum
A small species that has either red or yellow fruits, Very sweet and tasty!

[John J]

I did say it was easy, especially when Oron is involved. Mine has red fruit, which are obviously not ripe yet, that I can confirm are, as Oron says, sweet and tasty.
I do have a Psidium guajava which I like not only for the fruit, the smell as well as the taste, but also for the bark of the tree.
The Acca (Feijoa) sellowiana, the Pinapple guava, has tasty fruit and spectacular flowers.

[Alisdair]

Another great quiz; thanks, John!