Place scallions and potatoes in a large saucepan and add the stock or water, bay leaf and milk. Bring the mixture to a boil, then cover pan and simmer for 10 minute.
Add broccoli to the pan. Cut the fish into bite-sized chunks and add to the pan with the corn.
Season the stew well with freshly ground black pepper, then cover the pan and simmer for another 5 minutes or until the fish is cooked through. Remove the bay leaf, and transfer to a serving dish.
Garnish with scallions and serve hot with crusty bread.