Mix milk, cornmeal and salt in top part of double boiler. Put over boiling water and cook, stirring constantty, 15 minutes or until mixture is the consistency of thin mush.
Remove from heat, add butter and quickly stir into eggs. Turn into greased 1 litre casserole. Set on trivet in cooker and add 3 cm of hot water. Arrange a sheet of foil loosely over top of casserole. Cover and cook on high 1.5 to 2 hours or until bread is firm.
Serve at once with butter.
Makes 4-6 servings.