Mushrooms should be cleaned with a rough towel and cut into very thin slices. In a pan heat the olive oil with rosemary twig, put the mushrooms and add salt. Fry is very short, mushrooms should not be yawning. Remove from heat and put to cool. Cook potatoes with the skins, peel and smash. Leave to cool down. Add the eggs, pepper, salt, flour and nutmeg and stir to a smooth mass. Of mushrooms removing the rosemary and add to potato dough. In a pan with little fat pipette with a large spoon of the mixture is flattened, covered with foil and cook about 3 minutes on each side. Serve warm with a salad for example, sour dressing.