Peel and halve the onion and lard one half with bay leaf and cloves. Boil up about 3/4 litre of water. Wash the meat. Add meat, larded onion, salt, peppercorns and juniper berries and cook over medium heat for about 30 minutes.
Take the meat out and let it cool down. Pour stock through a sieve and measure 1/4 litre. Melt 25 g fat in a pot, dust flour over it and sweat it. Gradually add the stock, wine, milk and cream, stirring continuously.
Bring to the boil, season with salt, pepper, nutmeg and lemon juice. Simmer for another 5 minutes while stirring. Finely dice 1/2 onion. Clean, wash and halve or quarter the mushrooms. Heat 1 tbsp. fat in a pan.
Sauté the mushrooms for about 3 minutes while turning. Wash the chervil, dab dry and put 2 stems aside. Chop the remaining chervil finely. Add diced onion to the mushrooms and fry for another 2-3 minutes.
Cut the meat into cubes. Blanch peas in salted water for about 2 minutes. Add meat, peas, chervil and mushrooms to the sauce. Cut out the lid of the pies with a sharp knife. Heat up in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for 2-3 minutes.
Place the pies on plates and fill with the ragout, pour the rest of the ragout onto the plates. Garnish with chervil.