Ina Garten's flag cake

Here's the recipe for Ina Garten's (the barefoot contessa)4th of July flag cake. My sister in law Amy is to be thanked for introducing me to this incredibly yummy cake. I would suggest using half of the butter in the frosting, because a pound of butter seems excessive. I make it using remainder of the butter from the cake, so about 2 sticks. Maybe it pipes better if there's more butter. Enjoy!