Heat the oven to 220 C. Peel the potatoes are placed in savory cold water on the stove until it boils remain for 3 minutes, then drain. Two or three of them are cut into thin slices. Round tray with non-stick coating is smeared with butter, thyme twig placed in the middle and covered with a large circle potato. Other circles rank first in circles around it in the middle as overlap. Other potatoes are cut, put in a large bowl, add the melted butter, nutmeg and thyme leaves together with a little salt and pepper. Mix well, it was poured onto the stacked rings, pressed slightly to align the cake. Bake for 1 hour and 15 minutes, until the surface becomes brown and crisp. Carefully turned on a serving plate or board, sprinkle with sea salt and serve.