1 carrot, peeled and chopped
2 celery sticks, chopped
200g/7oz button mushrooms, left whole
1 onion, quartered
15 small pearl onions
small bunch fresh thyme
1 bay leaf
500ml/18fl oz beef stock
1 tsp black peppercorns
15g/陆oz plain flour
2 tbsp olive oil
75驳/2陆辞锄 butter
1 whole chicken, spatchcocked
120g/4陆oz block pancetta, chopped
750ml/1lb 10oz bottle red wine