Pack it into the hamper along with crusty bread and other snacks. Drain the gammon joint and weigh it to calculate the cooking time. Place in a clean pan and cover completely with water.
Bake for another 12–15 minutes or until the fish is cooked, the ham has crisped and the breadcrumbs are lightly browned. Meanwhile, to cook the spinach, heat a medium sauté pan and add the butter.