Feel free to add a splash of lemon juice or white wine for added flavor.
Traditionally, this recipe calls for sliced potatoes. However, I have made it with diced potatoes, which also works.
Fresh tomatoes work just as well as canned tomatoes. Canned tomatoes are already peeled, eliminating the loose tomato skin from the dish.
This recipe can be done with a regular filet of white fish like haddock, cod, halibut, or sea bass. Yes, tilapia and catfish would work, too. If using an unsalted fish filet, sear the fish and set aside, then reincorporate it towards the end to finish cooking.