Fancy ways to flavour fish:Mustard crust.William MeppemFlavoured breadcrumb crusts are a really nice way to add texture and flavour to fish,as well as to keep it moist. This one has flavour from the mustards and horseradish,and the seeds add a nice texture. You can,of course,add lots of different flavours to breadcrumbs and butter to create a host of crusts for fish and chicken. Sometimes by adding cooked things such as garlic,onion,or herbs,and a good sprinkle of salt and pepper,you can raise a simple piece of roast fish to another level.