Potatoes Anna

This elegant cakelike concoction is made with sliced potatoes, rather than the julienned potatoes used for the straw mat. If you are lucky you have a pommes Anna pan. Its two-piece construction allows you to turn the cake over without spilling the butter out of the pan. In its absence, you can use a nonstick sauté pan, pour off the butter, invert the potato cake onto a plate, and then slide the cake back into the pan, return the butter to the pan, and