01 -
If using uncooked chicken, simmer chicken in water with a little vegetable stock until fully cooked. Remove and discard skin. Detach meat from bones and cut into bite-sized pieces. Reserve strained cooking broth for the sauce.
02 -
Peel and dice carrots into 1 cm cubes. Wash and slice mushrooms. Trim asparagus; if using white, peel and remove woody ends. Blanche asparagus pieces in salted boiling water with a pinch of sugar for 2 minutes, then drain.
03 -
Melt butter in a large saucepan over medium heat. Whisk in the flour and cook, stirring, until the mixture turns golden-yellow.
04 -
Gradually pour in the chicken stock, whisking constantly to avoid lumps. Continue stirring until the mixture is smooth and slightly thickened.
05 -
Add whipping cream, mushrooms, carrots, blanched asparagus, and peas to the sauce. Simmer gently over medium heat for approximately 8 minutes, until vegetables are tender.
06 -
Remove saucepan from heat. Stir in egg yolk briskly to further thicken and give the sauce a glossy finish. Season generously with salt, freshly ground black pepper, and a splash of lemon juice according to taste.
07 -
Return chicken pieces to the saucepan and gently fold into the sauce. Warm through on low heat for 5 minutes; do not bring to a boil.
08 -
Serve immediately, ideally accompanied by white rice or creamy mashed potatoes.