Wash the potatoes and cook in boiling water for about 20 minutes. Drain potatoes, rinse and peel. Peel and chop onion and garlic. Wash thyme and rosemary and shake dry.
Pluck leaves or needles from the stems and chop. Beat the eggs and season with salt and pepper. Cut potatoes into slices. Heat oil in a pan. Brown the potatoes, garlic and onion, season with salt and pepper.
Fold in thyme and rosemary. Pour over the beaten eggs and allow to set for approx. 15 minutes at low heat. Turn out the tortilla with the help of a lid and let it slide back into the pan and brown slightly.
Turn the tortilla out of the pan and cut into cubes. Tastes hot or cold. Serrano ham can be served with it.