1. The fish mix you could use depends on when in the year you cook the pie, but in principle, use nice and seasonal fish. The smoked fish one should never be missed/omitted as it is the whole taste that adds to this recipe. 2. If you don't have green beans you may replace those with garden peas which can be either frozen or fresh. 3. 1/2 red pepper can be amazing addition if you have and like. Just cut into small cubes and add it.