Wash the chicken thoroughly inside and out and place in a large pot. Add 2-2 1/2 litres of cold water until the chicken is covered. Clean or peel the soup greens, wash and roughly cut into pieces.
Peel and halve the onion. Add soup vegetables, onion, 2 tablespoons of salt, bay leaf and peppercorns. Bring to the boil and simmer covered for about 1 1/2 hours.
Clean, clean and halve the mushrooms. Peel carrots, cut them lengthwise in half and slice them. Lift the chicken out of the broth and let it cool down a little. Pour broth through a sieve and collect.
Bring some stock to the boil and cook the carrots for about 5 minutes. Add peas and pour vegetables through a sieve. Collect broth.
Heat the oil and fry the mushrooms for about 5 minutes. Season with salt and pepper. Prepare rice in boiling salted water according to package instructions. Fill up vegetable chicken broth with remaining broth to 1 litre.
Heat the fat in a large pot and sauté the flour in it. Add stock and cream while stirring, bring to the boil and simmer for about 5 minutes while stirring. Remove meat from skin and bones, cut into pieces.
Season the sauce with salt, pepper and lemon juice. Heat meat, vegetables and mushrooms in the sauce. Arrange rice and fricassee and garnish with lemon wedges.