Mussels in Black Bean Sauce

The Chinese in Hong Kong enjoy fresh mussels stir-fried with fermented black beans, as in this recipe. Or they are dried in the sun and chopped for use in stuffings. Fermented black beans are often used in Hong Kong cooking, unchopped and left whole – they thus have a more subtle flavour and taste and are less pungent than when they are chopped. This is a Hong Kong variation on a traditional recipe and is quite delicious. You may substitute clams if you like, but the cooking time will be sl