This is a family favorite for over 50 years. It makes a sauce on the bottom
1 Beat together egg yolks, lemon juice, lemon rind, and butter or margarine until thick and lemon colored. Combine sugar, flour, and salt; add alternately with milk to the yolk mixture, beating well after each addition.
2 Beat egg whites until stiff. Blend egg whites into batter on low speed of electric mixer. Pour into 8 inch square baking dish.
3 Place a pan of hot water in the oven, and set the baking dish into the pan. Bake at 350 degrees F (175 degrees C) for 45 minutes.