This is the fruit known as the Hand of Buddha.
Hand of Budda

Hand of Budda

This is the fruit known as Hand of Buddha, bent on world domination.

Hand of Buddha eating a gingerbread house.

Hand of Buddha eating a gingerbread house.

The nice lady at Whole Foods said it was much like a lemon, only about twice as sour, with a lot of rind.  I asked her if I could candy the peel, and she confirmed this was the case.

Run, little gingerbread men!  Run!