Mix grandulated vegan sugar and dark cocoa in saucepan. Stir in soy milk, oil, salt and margarine and heat to boiling. Continue to boil for 3 minutes, stirring occasionally. Let mixture COOL completely.
After mixture is cool, stir in vanilla. Beat in the powdered vegan sugar a little at a time until desired consistency is reached.
Feel free to add coconut shreds or chocolate shavings in the frosting, or simply sprinkle on top of frosted cake. Sprinkling powdered vegan sugar on top of the chocolate frosted cake is also attractive.
Frosts one 9 inch cake.