2 celery sticks, diced
1kg/2lb 4oz chestnut mushrooms, sliced
1 garlic clove, crushed
2 onions, 铿乶ely chopped
3 tbsp freshly chopped parsley
salt and freshly ground black pepper
2 tbsp soy sauce
1 tbsp sunflower oil
700ml/1录 pints chicken or vegetable stock
55g/2oz unsalted butter
150ml/录 pint double cream