In a large, heavy frying pan, melt the butter over medium-high heat until pale golden, about 4 minutes. Add the sage or basil leaves and cook until crisp, about 2 minutes. Stir in 1/2 teaspoon salt, 1/4 teaspoon of pepper, and the nutmeg. Season the sauce with more salt and pepper to taste. Sprinkle with the Parmesan cheese, and serve.