Peel fresh peas. Peel and finely chop the onion. Melt butter in a pot. Sauté onion in it, dust with flour and sauté. Gradually deglaze with broth, bring to the boil while stirring. Add cream, bring to the boil while stirring. Season to taste with salt, pepper and lemon juice
Wash the meat, dab dry and dice coarsely. Add meat and peas to the sauce and simmer for 10-15 minutes (add frozen peas about 5 minutes before the end of cooking time). Wash and clean the mushrooms and drain well. Heat oil in a pan. Fry the mushrooms for about 6 minutes, turning them over. Season with salt and pepper
Wash herbs, shake dry, pluck leaves from the stems and cut finely. Add mushrooms and herbs to the fricassee, except for something to sprinkle on top. Arrange fricassee on plates and sprinkle with remaining herbs