I guess I've made pretty normal cakes, but Laurie from Cake Alchemy swears by beer buttercream. I've seen her make it a couple times now and she even used beer instead of simple syrup to moisten a chocolate groom's cake on last night's Amazing Wedding Cakes show.
I can't bring myself to make these kinds of cakes. It reminds of this book that was all the rage a couple years ago among my mommy group. Deceptively Delicious http://www.deceptivelydelicious.com/site/index.php Parents were making brownies with spinach so their kids would eat the spinach. Come on people! Don't do that to the poor brownie! Plus, how does it really teach good eating habits? Have some chicken (and cauliflower) nuggets with a (spinach) brownie? They may get the nutrients, but not good habits. When I see cake recipes like this, I can't help that they are trying to be deceptively delicious...
Yes, yes, yes I have made chocolate beet cake; lettuce cake (very similar to carrot cake but very heavy....more a sweet bread than cake) and tomato spice cake (excellent).
Also have a prune spice cake recipe and a few others I can't remember right off hand.
If you didn't know what it was you would like them - believe me! Don't wrinkle up your nose like that LOL
I have a recipe book with a tomato soup cake. Haven't tried it though.
the cake doctor?? I am reading that right now and I saw the tomato soup spice cake today, wow, very unusal I would have never thought, hey I have this tomato soup here, what should I do with it. oh put it in a cake???
I recently tried a chocolate cake recipe with beets in it (replacing the fat) and I didn't' care for it at all - it tasted like beets to me.
But, I have replaced up to 1/2 the fat in a recipe with finely grated and peeled zucchini (in vanilla cupcakes) and it was great! No one was able to tell there was anything unusual about it and you did not see or taste any hint of Zucchini!
I can't think of anything particularly unusual that I've ever put in a cake, but I have a recipe for a replacement for graham cracker crusts that uses crushed hazelnuts instead of graham crackers. It's especially good filled with chocolate pudding or mousse!