How to cook
Mix the sugar, yoghurt and baking soda in a deep pot. While beating with a mixer, gradually add the oil, and then the flour. Stir until you get a completely homogeneous mixture.
Set aside half of the mixture and add the cocoa to it. Pour the mixture into a greased baking dish, starting with the non-cocoa one, then the cocoa one on top. Bake the pie in a moderate oven.
Once removed from the oven, pour melted chocolate or glaze over it.