What size cake pan would you use to cut out a flip flop that would feed 25 people? Also, what is your go to yellow birthday cake recipe that would hold up to this carving....I always use WASC and change the cake mix I buy but didn't know if there was a better bday cake recipe you used.

Are you wanting 1 flip flop or 2..You can carve 1 flip flop from a 9x13 slab and get about 20 servings but if you want a set of flip flops carve from 2-9x13 cakes...and get about 40 servings..You could always make them smaller by using a smaller pan like a 10 inch square etc but the proportions would look fairly small.I use any flavor the customer requests.

A 9x13x3 (torted and filled twice) would be a good base as you could serve slightly smaller servings than with a 2in deep layer. You could get approx 38 servings from the full cake (2x1.5x3 = 9 cubic inch serving compared to a 2x2x2 = 8 cubic inch traditional sheet cake serving), so allowing for some loss with carving you should be good to go.

This is good:

http://www.how2cakes.com/thongs.html

It looks like a 10" square, but you would need to print off the template twice and line it up on the back of your tin to know for sure.

I'm not sure how many they will serve, just enlarge the template with a photocopier to make it bigger or smaller.