THIS IS A VERY LIGHT version of a spinach soufflé; if you make it with frozen spinach, it is also quick and easy. Just be sure to squeeze the spinach as dry as possible. The measurement for nutmeg here is for 2 or 3 pinches, which is difficult to measure accurately, so if in doubt, skimp; although a little nutmeg enhances the flavor of spinach, too much will overpower it. The soufflé serves two for lunch or four as a first course.