Preheat your oven to 350 degrees. Peel a squash (or two if they are small), half vertically, and scoop out the seeds. Make slices across halves about half an inch thick. Butter a gratin dish and layer the squash with a light dusting of freshly ground nutmeg and a sprinkle of salt. Pour over cream until squash is just covered. Grate gruyere or parmesan on top, and place in the oven approximately 30 minutes to an hour. When squash is tender and cream is reduced, broil the top to brown, if necessary.
Truc (Tip): You can use any kind of squash for this dish.