Melt butter in a casserole dish or 8-inch square pan, arrange sliced apples in it. Sprinkle with sugar and cinnamon.
Cream shortening, add sugar gradually, beat well. Stir in egg and molasses. Add sifted dry ingredients alternately with milk. Beat until fluffy. Pour cake batter over apples and bake at 350F for 45 minutes. Turn out upside down and serve with Satin sauce.
Beat egg and water in saucepan until foamy. Stir in molasses and salt. Cook over low heat 1 minute stirring constantly. Remove from heat and stir in lemon juice and vanilla. Serve hot.