Sift the flour, cocoa, and baking powder into a large bowl.
Add the sugar, liqueur, water as needed, you might need a little more, or a little less than the stated amount, and stir with a spoon until you get a smooth cream.
Grease and flour a pan, and fill it with the dough, then transfer everything into an over preheated to 160°C.
Bake the cake for 45-50 minutes, then take it out of the oven, pull it out of the pan and let it cool wrapped in a clean kitchen cloth (do not skip this last step!).