This is a technique recipe. It was published recently in the Sunday section of the New York Times. Henrietta's is located in the Charles Hotel, a few blocks from Harvard Square. The idea is to clarify the butter and cook the potatoes the night before. Clarified butter can tolerate higher heat used to brown the potatoes. The potatoes must be kept whole until the morning, at which time they are dry and can be grated. Flip them with a large spatula or over a plate. I find it easiest to slide it unflipped onto a plate, put another plate on top, flip it and slide it back into the pan. Time does not include preparation the night before.