Savoury Black Mushroom and Chicken Casserole

This hearty dish is served in restaurants, food stalls and homes throughout Hong Kong. The recommended Chinese black mushrooms have been cultivated in the southern temperate parts of Asia for more than a thousand years. The Chinese never used them fresh, preferring them dried, because they keep longer and lose none of their flavour. They come in many grades but although they are always expensive they are nevertheless widely used in Hong Kong cooking. They are highly esteemed for their disti