Love a bit of smoked fish with white fish and prawns in a fish pie ... this recipe is v nice:
Boil an egg (hard boil). Poach smoked/white fish in some milk, put to one side. Make a white sauce from the milk, stir in the fish with some prawns, dill and a bit of nutmeg. Microwave some frozen spinach, or cook some fresh. Fry an onion and combine with spinach & lots of black pepper. Layer fish/spinach in a casserole dish, grate some cheese on the top. Bake for 20 mins or so. Yum!
If you don't mind the carbs, you can top with mashed potato before the cheese. Otherwise, this is v low carb with just the milk and flour to account for.