Tangerine chocolate marble cake with tangerine icing

I keep telling you about recipes that go wrong and how I do not give up on them. This cake is sort of an example: I made the chocolate orange marble cake from DH mag (#44) and it turned out miserable - an 8-cup capacity pan would not hold that much batter, but I insisted on trusting the recipe. I ended up tossing the whole cake. :(

I decided to make it again – I adore marble cakes – and used a