There are many combinations you can try.

Grate a carrot, a couple stalks of celery and cheddar cheese with the course side of the grater. Substitute sweet peas in the place of celery, if desired.
Grate the zest of a lemon and 1/2 of a fresh red chili using the fine side of the grater.
Chop sprigs of fresh parsley.
Gently fry chopped leeks and sliced mushrooms in olive oil.
 Add salt and pepper to taste. You can squeeze lemon juice over the ingredients in the baking dish and add a drizzle of olive oil.,

Sauté a shallot. Add a couple tbsp. of white wine vinegar and boil until it evaporates.
Stir 1 to 2 oz. of flour.
Slowly add in 15 oz. of fish stock and stir it constantly as it cooks over medium heat. Bring it to a boil until it thickens then remove from heat.
Add 6 tbsp. double cream and a tsp. or 2 of chopped chives or dill. Add salt and pepper to taste.
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Choose as many or as few of these vegetables and additions you want for your homemade fish pie.
Add your choice of seasonings.
Make an optional creamy sauce for your fish pie.Stir all the ingredients in the baking dish together with a large spoon until well mixed.Preheat oven to 400 degrees F (200 degrees C).
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