12 baby carrots, peeled
2 celery sticks, halved
mixed fresh herb leaves, such as flatleaf parsley and chervil, to garnish
1 fennel bulb, trimmed and cut lengthways into pieces, fennel fronds separated and reserved
2 garlic cloves, peeled and left whole
300g/10陆oz baby king oyster mushrooms, trimmed (or king oyster mushrooms, chopped)
8 shallots, peeled and left whole
10g fresh tarragon leaves, plus extra to garnish
600ml/20fl oz chicken stock, plus extra if required
85g/3oz plain flour
sea salt flakes and pepper
1 star anise
175g/6oz butter, softened, plus 50g/1戮oz, diced, for the sauce
150ml/5fl oz double cream
1 whole chicken, about 1.5kg/3lb 5oz
600ml/20fl oz white wine, plus extra if required