Marble Cake

"First, let me reference the previous comment regarding the cream of tartar; cream of tartar isn’t an essential ingredient and is used, mostly, as a flavor additive. It can be added in the first step with the other dry ingredients, or, if preferred, it can be added to the egg whites just before beating. I followed the recipe almost exactly. I added a small amount of extra sugar to the chocolate batter. I prefer a slightly sweeter chocolate than the instructions produced. The cake turned out very nicely. It was light and fluffy and incredibly tasty; however the chocolate batter, being a bit heavier, did sink to the bottom just a bit. Aside from the layering, the cake turned out perfectly! I cut mine in half and spread a butter cream and walnut frosting on the top of one and then topped that with the other half of the cake. After that, I frosted the whole thing with a cream cheese frosting. It was delectable!"