Preparation
Grease a large dish with
butter. Cut the potatoes and onion in fine slices, season with salt
and pepper, add the saffron and put in the oven to gratine.
In a big casserole dish
cook the mussels till open, remove and put aside. Add the mussels stock
to the potatoes and onion. Add oregano, put everything in the oven for
50 minutes. After that, put the hake fillets over the potatoes and put
in the oven again for 8 minutes. When ready add the mussels and the
parsley.