Melt the butter and keep it aside.
Whisk the commercial egg replacer, water, and sugar till light and fluffy.
Sift the flour and cocoa powder.
Fold it into the egg replacer and sugar mixture.
Fold in the melted butter , make sure everything is well incorporated.
Pour into a greased and lined tin. The cake will not rise but puff up a little.
Bake at 180 degrees C for 20 minutes. This is not the exact time, one has to watch it , it should be soft in the centre.And as you press down gently on the cake whilst its baking, the crust should need a bit of pressure to crack. When this happens the cake is done.
The cake will not rise but puff up a little.
Leave to cool in the tin for at least an hour.