I thought christophine was a well-known vegetable, but now I realize that this is not so. Anyway, I like the taste of them, although the flavour is not very distinct. They tend to have a slightly sweetish flavour, and are nice and crunchy. I would usually slice them in medium-sized strips before cooking them, and they do cook fairly quickly. Eating them in the skin would be more nutritious, but I peel them most of the time.
What are they? Perhaps some of us may know them by a different name. Do you have a photo you could share?
I rarely peel anything that has an edible peel. In fact the only thing I can think of is maybe sweet potatoes, and I've never really considered why.