I didn't know what the they where but somebody gave me some and I just peeled it, cut it up and steamed it, but you could totally throw this into all sorts of casseroles, soups, roasts or hangi it's really nice! Not too strong of a flavour kind of like a potato with a celery-like tinge, 10/10 will have more often ๐
Update: apparently they turn to mush if you roast them
It's called Chayote. Really tasty. We use it to make clear soup with chicken or pork slices.
https://en.m.wikipedia.org/wiki/Chayote