1Roast the chicken bones until golden brown in an oven at 200°C.
2Soften shallots, carrot, and celery with a pinch of salt in a pan. Add mushrooms, garlic, thyme, rosemary, and bay leaves, then add the roasted bones.
3Deglaze the pan with white wine, reduce until almost no liquid remains. Add chicken stock and soy sauce, reduce to a sauce consistency, and pass through a sieve.
4In a pan, heat butter and olive oil until foaming. Add shiitake mushrooms and season with salt and pepper. Add a splash of white wine and the strained chicken sauce. Reduce again and finish with crème fraiche, roasting juices, lemon juice, tarragon, and parsley.