Preheat oven to 375 degrees F

To Make Sour Milk: Combine 1/2 cup minus 1-1/2 teaspoons milk, with 1-1/2 teaspoons lemon juice or white vinegar. let sit for 5 min

To make the bottom wet layer: Combine the molasses, 1/2 cup of the white sugar,1 egg, water, 2 tablespoons of the flour and lemon juice and rind. Mix thoroughly and pour into the unbaked pie shell.

For the top cake layer: Cream the butter or margarine with the remaining white sugar until light and fluffy. Add the remaining egg and beat thoroughly. Sift the remaining flour and baking soda together then add to the creamed mixture alternately with the sour milk. Spread over the top of the mixture in the pie shell.

Bake at 375 degrees F for 35 to 40 minutes. Check the cake-like top for doneness and let cool.