Make a lid of the cabbage leaves you have saved. Tie them in place with a string. Place in a deep kettle. Add salt and enough boiling water to half cover the cabbage. Cover the kettle with a lid and boil gently for 3 hours.
To serve, remove the string and the lid of leaves and turn the cabbage onto a warm serving plate with the forcemeat down. Serve with melted butter or cream sauce.