Makes 6 servings
Cut the fish fillets into 2-inch pieces. Heat a large saucepan over medium heat. Add the salt pork and cook until crisp, 8 to 10 minutes. Add the onion and cook until tender but not brown, 5 to 7 minutes. Add the boiling water, potatoes, limes and chiles; cook for 10 minutes. Add the fish and simmer for 10 minutes. Discard the limes. Season with salt and pepper; serve hot.