Whisk together the butter or margarine with sugar
and the vanilla-flavored sugar until frothy.
Add the eggs to the mixture one at a time.
Combine the flour,baking soda and baking powder,
sift this mixture over the dough and then stir together well
all the ingredients, including 3/4 of the milk.
Remove about one third of the dough and combine this
with the remaining amount of milk, the cocoa,
and the essence of rum, or the cherry liqueur.
Stir well.
Then place the two portions of dough into a greased ring mould,
alternating the light and dark mixtures in layers.
Finally run through the completed mix with a fork
to create an additional swirling effect.
Bake the cake in the middle of a pre-heheated oven at 180
centigrates for approximately 45 minutes.
Turn the cake over a serving plate and, sprinkle with sugar as soon as it has cooled.