A very good fish soup from Trine Hahnemann.You do need a good stock, so allow plenty of time to prepare this and sweettalk your fishmonger into giving you the fishbones!
This is from ” Cook at Home” by Peter Gordon. Its his stepmothers recipe and he thinks it is the best in the universe, and almost better cold the next day. And very easy if you use ready made pastry. In summer, slices of fresh tomatoes on top work well too.