Cut the soup greens into small cubes. Bring the chicken to the boil with water, soup greens, salt and pepper and simmer for about 1 hour at low temperature. Take out the meat and cut it into pieces.
Heat the margarine in a saucepan, dust with flour, stir with a whisk and deglaze with stock, white wine and lemon juice while stirring. Cut the asparagus into pieces (if fresh, peeled and pre-cooked), add with the mushrooms (if fresh, cleaned and pre-cooked) and reduce a little. Stir in the sour cream, season with salt, pepper and nutmeg. Fold in the meat and peas and heat for about 2 minutes.