Clean or peel the soup greens and cut into pieces. Wash the chicken breasts. Cook the chicken breasts and soup vegetables in 1 litre salted water for approx. 30 minutes. Clean, wash and cut the asparagus into pieces. Take chicken breasts out of the broth and let them cool down a little.
Pour broth through a sieve and collect. Cook the asparagus, carrots and peas for about 5 minutes, put them in a sieve and collect the broth. Remove flesh from skin and bone and cut into bite-sized pieces. Place the pies on a baking tray and heat them well in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3). Melt the fat in a pot and sauté the flour in it. Deglaze with stock and wine while stirring. Season to taste with salt and pepper. Mix cream and egg yolk and add to the sauce. Stir in vegetables and meat, season again.
Deglaze with stock and wine while stirring. Season to taste with salt and pepper. Mix cream and egg yolk and add to the sauce. Stir in vegetables and meat, season again. Arrange chicken fricassee in the pies. Garnish with chervil and lemon