This classic French potato gratin dish literally translates as "Potatoes in the Style of the Baker's wife". The story is, that in the past, a French family would prepare these potatoes and then take them to the local boulangerie, the baker, to be cooked in the even heat of his oven, hence the name. Any sort of good quality stock will do, chicken, lamb, beef or vegetable. For a richer taste, a ratio of 50% hot stock and hot milk/cream can be used. If using lamb stock, it is nice to sprinkle the top of the potatoes with fresh Rosemary, and I often add a sprig of thyme to my potatoes when baking them. I have found that melted butter gives a better result than dotting butter, no burned and upturned edges anymore!