Fruit ID please

in Plants
I've been asked (and have failed) to identify this fruit which was picked 'from some sort of vine' in Spain a couple of weeks ago
It's described as being about the size of an avocado, having a spongey texture, with a milky sap, and containing several seeds.
Any ideas folks?
Last edited: 23 October 2017 15:01:29
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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We discounted Chayote because chayote only has one seed.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thank you Philippa
I'll pass that on to my friend ... it does look as if that may be it ... she'll be excited ... she lives in southern Wiltshire so quite mild in sheltered corners. 
Last edited: 23 October 2017 15:28:56
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Is it a chirimoya (aka custard apple)?
Here are photographs of them:
https://www.google.co.uk/search?q=chirimoya&dcr=0&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiQsKi9_YbXAhVPmbQKHe9sD_oQ_AUICigB&biw=1366&bih=659
Thank for the suggestion Grassproblem ... I'll pass sit on,
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.