Combine flour, sugar and shortening. Blend with a pastry knife, or quickly in a food processor, until crumbly like oatmeal. Place the crumbly mixture in a greased pie pan, and spread evenly on the bottom and up the sides, being careful not to compress the mix.
Blend molasses, baking soda, and boiling water; carefully pour over the crumbs.
Bake for 45 minutes.
Sides will be slightly puffy when done. Cool before serving and slice like pie. If the pie breaks apart, or you desire variety, scoop it out and serve in a dish topped with whipped cream. No one will ever know the difference.