Good! Was not really sure about the mustard, but it did give the fish a very good flavour. DH loved it, but I think it needs something more to give it that edge... will try a couple of things & let you know how it goes.
I`m giving this 5 stars because it was fun and different and tasty! I cut the recipe down to make for 2. I didn`t have any mustard oil so I used olive oil. Next time will steam for 15 minutes.