Tilapia and potatoes in tomato sauce

New Pesach, new recipe. Few ingredients and can use frozen fish.

1lb frozen tilapia
1 medium can tomato sauce
2~3 large potatoes
Salt and whole black pepper to taste

Into a saucepan, dump tomato sauce (can be diluted with water), add salt and pepper, add frozen tilapia and bring to a boil. Simmer until fish is fully cooked. Remove fish and add potatoes, cut into triangles. Simmer until potatoes are tender and meanwhile, break up the tilapia fillets into small pieces. After potatoes are cooked, mix in the fish and serve.