Cook the potatoes in a large covered pan in boiling salted water for 10-15 minutes or until soft. Squeeze the potatoes in a saucepan, then return them to the pan. If you want, add primrose, garlic and 6 tablespoons of potato oil with a lot of freshly ground black pepper. Cover the pan with a lid and shake it well to mix all the flavors.
Pour into a bowl and sprinkle with remaining olive oil. Serve hot or cold.