My friends daughter is obsessed with Dr. Pepper and asked if I could make her cake that flavor. Has anyone ever tried this with any succcess??

No but I had to make a Coke mousse once and I ended up reducing 8 CANS of Coke just to make it taste a little like it (for a 10" cake). Yeesh.

http://annies-eats.net/2009/08/19/cherry-coke-cupcakes/

I would use this -sub in the Dr. Pepper. Maybe add a little extra cherry juice?

Maybe you could make the cake in the above post. And instead of just using plain simple surup to 'seal' the cake and keep it moist between layers, you could use a dr. pepper syrup. So just substitute dr. pepper for the water and reduce down to a simple syrup consistancy. You might not even need to add the sugar (infact, I wouldn't). I would just let some of the water evaporate from the dr. pepper until it's a little thickened into a syrup texture and then use that. Or, just simply brush straight dr.p over the cake without reducing it. Either way I believe this would inhance the flavor. =]

PS...TEST YOUR CAKE ON YOUR FAMILY BEFORE YOU ACTUALY USE IT FOR THE CLIENT CAKE.

I have a Chardonnay cake recipe that has 300ml of Chardonnay, I substitute Lemonade for chardonnay. This may work if you add dr pepper, I could email you the recipe if your interested?

Ive used Rootbeer, Chery Coke, Orange Crush and 7up. I just substitute the water with it. My kids love it.

I have a Dr. Pepper cherry icecream topping that I have used on a small cake. It is a very thick syurp that I drizzled on each layer before the BC. I let the cake sit for a bit and the cake absorbed the syurpand it turned out great!