"Is that a..?"
"Yup."
"Self-regenerating cake, since you were eating some when I pulled you over, yet there's not a single cut marring its surface?"
Anyway, America has moved on to giant cupcake pans. Besides, if you really wanted an uber-American donut-cake, you'd just use two bundt cake pans, which gets you twice the cake.
That really doesn't look much like a giant donut-- donuts don't have big ridges around their edges. Still, +1 because with a little creativity, you could probably make a giant hamburger cake with this. And make it out ot MEAT.