TerryJ wrote:
There is an interesting episode in the journal of captain bligh after
te bounty mutiny when he sailed across the pacific in a little boat.
They stopped for a wile on islands of the gt barrier reef where they
found food by each adopting one item for a few days. if after 3 or so
days a man was still ok that meant his food was safe to eat. I have
never felt that desperate myself!

Its a standard "survival" method. You take a small piece of the fruit.
If it feels soapy or oily, or smells odd don't eat it.
The next test is to place it on your skin (arm or somewhere) for an hour
or two. If you develop a rash, discard it.
Next try placing a tiny piece on your lips. If there's any burning or
tingling, discard.
Next place it inside your cheek, and keep it there for a few hours.
Again you're looking for skin reactions, bad taste, or feeling ill.

If it passes all these tests and you haven't had any side-effects, its
probably safe.