Mix by hand in a bowl - flour, sugar, salt, and Crisco/Parkay. Mix with your hands until it's crumbly. Take out 1/2 cup of the crumb mixture and set aside. In another bowl, mix with a spoon the molasses, water, baking soda and stir until the baking soda fizzes. Add the crumb mixture to the molasses mixture. Mix thoroughly, then pour into the 10” unbaked pie crust. Pour the 1/2 cup of crumb mixture that you set aside over the top of the pie. Bake at 325 degrees for 1 hour. Test with a toothpick for doneness.