Whole orange cake

I love orange cake and am always on the lookout for a new recipe that improves on my current one.  This is it.  I made this cake last week after thinking about the recipe for about a month.  Yes, I know, over thinking, but I was trying to work out why this recipe would work and if it did, would it be bitter.  It isn't.  Orange cake is a great standby if you have an orange tree in the backyard