Sucrine du Berry squash
With a name like "Sucrine du Berry," it's got to be good! And it is, though the mature squash have a lighter color that's closer to a classic butternut than the greenish hue depicted above. Beggars can't be choosers when it comes to Creative Commons images, so you'll have to use your imagination, if you still have one.
The pledge to deliver beta-carotene was a serious one: These squash are ALSO orange, which you should know by now is a sign that a food is really, really good for you, Cheetos notwithstanding. Sucrine du Berry squash is pretty close to butternut squash, perhaps a bit less sweet; you can typically use it for any butternut recipe just fine. Squash and sage were made to meet in an oven, so throw them together in there with some oil, salt, pepper, and whatever else you like, and pat yourself on the back for avoiding all major diseases for as long as you live.