Re: Mystery tree ( for me)

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It looks like jujube zizyphus.  That is in the sunset western garden book, I think.  The fruits are just beginning to ripen on my tree and I love them.  They turn a reddish brown color and are crisp and delicious like a fresh crisp apple.  Then they dry right on the tree and are used to candy and use as dates in any recipe calling for dates..  Asian people put them in soups to clarify the soups during winter and they believe they have strong medicinal properties for women's health.  You can buy them in health food stores dried, quite expensive. When my fruit is ripening and I have guests, the females just sit under the tree and eat them until I make them stop.  Eating a few is ok but you can overdo it and wish you had stopped.   I don't know where you live but the photo you show already has ripening fruit in the drying stage.  The fruits are edible both hard and freshly ripened or drying as in your photo.  Like grapes/raisins, they have a different taste and texture depending on the stage of ripening.