I'm not sure if I am right or not, but I have never seen this in the recipe section here at WI.
Please tell me if I am wrong or not.
If it is an unknown one, I am pretty sure that there is pineapple in it. =]
Cocoabean is right, there are several foods available only through vacation island. Sadly that's the only place to get them, they would be fun to make too!