The Once-a-Year Citrus Cake

Every year for about ten years I've made a certain "Rainbow Citrus Cake" some time in the spring. I can't really call it a tradition, because it has moved around from one occasion to another over the years. I think the first time I made it was for Mother's Day, and then it stayed as a Memorial Day staple for several years. 2008 saw it grace a PEO luncheon table.
I've been making desserts every week for the Wednesday suppers at our church here in Virginia, and I plan to make the citrus cake for tomorrow. There's nothing special about tomorrow, as compared to any other Wednesday, but I want to get a chance to make it once here.
To describe it as "once-a-year" may be a bit misleading, because I try so many new recipes that very few things are made more than once in any given year. Something that does get made each year is usually a favorite, and those that are several times a year are definite favorites.
The citrus cake is labor-intensive, and the finished product doesn't freeze well, which is why it has to be for a group. A tricy part is dividing the batter into thirds and getting them even! Each third gets a different citrus rind and color to match. The filling between layers is lemon, and the frosting is orange.

I think I'll make up some part of it this afternoon.