So I saw this plant today.
Big fat berries with a giant seed, almost no flesh.
White Fringetree is said to be a relative of the olive, and could be treated as such.
The lack of flesh and large amount of seed makes these disappointing, but it made me wonder, are the pits of olives edible?
Well, maybe?
It's not a traditional thing, people will swallow a few here and there.
Rather than pursuing that weak lead it occured to me to ask if olive oil was made with the whole olive.
It is, the whole fruit is mashed up.
So, maybe White Fringetree could be a perennial oil seed, hardy down to zone 3.