Actually this is a citron and is otherwise known as a bushakon or fingered citron (see http://en.wikipedia.org/wiki/Buddha's_hand). I found this at Whole Foods and they said they only have them this time of year. It isn't juicy like a lemon, but rather is more like a source of lemon zest. I couldn't resist buying it just because it is so unusual. I don't think it will last long enough for me to use.