Simmer the fish gently in the water for about 10 minutes, then add potatoes, onion, water, and corn.
Simmer for another 10 minutes, and then add 3 cups of milk and bring to the boiling point – but do not boil. Turn off the heat, and add a tablespoon of butter (a nice touch, but optional). Salt to taste.
Give it a good grinding of pepper, and serve with ¼ pound salt pork, diced, fried, and drained so it is at its crispy best.