1 .Put the swede into a large pan, cover with cold salted water and bring to the boil. Cover the pan and boil gently for about 40 minutes, until quite tender. Drain well in a colander.
2. Return to the pan. Mash the swede, add the butter and seasoning and cook over a high heat, stirring frequently to drive off all excess moisture.
3. When a dry, stiffish puree is formed, adjust seasoning and spoon into a serving dish. Garnish with parsley.