Galette Lyonnaise (Lyonnaise Potato Galette)

Yield:	6 Servings
Categories:	French, Potatoes

2	kg	Baking potatoes (2 pounds) peeled
2	md	Onions
6	tb	Butter; unsalted ( 3 oz)
		Nutmeg; freshly grated
		Salt
		Pepper; black, freshly ground