Grease a pan with some vegetable oil. Melt the margarine. Make your egg replacer mix in a small bowl. Preheat oven to 350 F
In a large bowl, mix sugar, cocoa, vanilla and salt. Add egg replacer to the sugar mix and blend well.
Add sifted flour to egg/sugar mixture and do your best to blend well.
Pour in the melted margarine and stir until it's shiny brown (but don't stir for more than one minute).
Pour the mix into the pan and bake for 20 minutes (or more, if you're no fan of sticky chocolate cakes)
Leave it to cool for some time, then have a piece. The PMS-monster says you should eat it all, but if you're feeling nice it's a great cake to share with lots of people. Keep it in the fridge, it's great cold.
Note: I have not tried to make this with any other egg replacer than the powder version you buy in supermarkets. If you're using tofu or anything else, you have to find your own measurements to make it work.