Hard boil the egg in boiling water for about 10 minutes, rinse with cold water and peel. Peel, wash and chop the potatoes. Wash cauliflower and divide into small florets. Clean, peel and slice the carrot.
Bring the stock to the boil and cook the potatoes and vegetables covered in it for 12-15 minutes. Drain the vegetables and collect the broth. Bring 1/8 litre of stock to the boil and add sauce thickener while stirring. Bring to the boil again briefly.
Stir cheese and sour cream into the sauce and season with salt, pepper and nutmeg. Add the vegetables to the sauce and warm them up briefly. Wash parsley, dab dry and chop, except for something to garnish.
Chop the egg as well. Put the vegetable ragout on a plate and sprinkle with egg and parsley. Serve garnished with parsley.