Peel the turnip and cut into cubes. Peel and wash the potatoes and cut them into halves or quarters depending on their size. Cook potatoes and rutabaga in boiling salted water for 20-25 minutes.
Clean, wash and cut the radicchio into pieces. Roughly chop the walnuts. Clean the mushrooms and quarter them lengthwise. Peel and finely dice onions. Wash rosemary, dab dry and chop needles finely, except for something to garnish.
Dab meat dry and cut into thin strips.
Heat 2 tablespoons of oil in a frying pan, fry the mushrooms in it while turning and remove. Add 2 tablespoons of oil to the pan and fry the meat for 2-3 minutes, turning it over. Add the onions and radicchio and fry for approx. 5 minutes.
Add the mushrooms, walnuts and chopped rosemary. Deglaze with sherry, pear syrup and vegetable stock. Season with salt and pepper and simmer at low heat for about 5 minutes.
Bring milk and fat to the boil. Drain the turnip potatoes, add the milk-butter mixture and mash with a potato masher until mashed. Season to taste with salt. Arrange the mashed potatoes and shredded potatoes on plates and garnish with rosemary.