I wonder if you have tried the Black Forest Frozen Dessert recipe I included in my valentine newsletter? If you haven't yet, well this is how it looks. I used the brown sugar brownie recipe for the cake base. White sugar is white death and I try to avoid it every chance I get. The result is a mildly sweet cake spiked with the flavors or rum and cherries.
No need to use a fancy silicon heart shaped cake mold or anything to make this cake. A regular springform mini cake pan would work pretty well.