1 carrot, roughly chopped
1 stick celery, roughly chopped
squeeze lemon juice
1 onion, roughly chopped
2 tbsp chopped fresh parsley
mashed potato, to serve
1 bay leaf
salt and freshly ground black pepper
30g/1oz flour
6 black peppercorns
30g/1oz butter
2-3 tbsp double cream
1 free-range egg yolk
4 skinless chicken breasts
150ml/ΒΌ pint white wine