Fruits of the genus citrus tend to be some of my favorites, and I rarely find one that my taste buds do not agree with (although I am not very partial to grapefruit).
But this was before the Palestinian Sweet Lime (PSL).
Handling this mystery fruit prior to cutting it open, you could be convinced this thing to be an unripened lemon. Yet upon cutting the object open (which shall henceforth be described as an object, since describing it as a fruit might imply that this thing is in some form edible), you will find the inside to be filled with nothing but what I am assuming can be accurately described as pith (the white part inside of your favorite citrus fruit) with a few seeds.
This thing is incredibly bitter and lacks any real incentive to continue beyond the initial taste. I discovered the PSL when some friends returned with a bag full gifted to them by a man in Ramallah (as I do not know how or why a store would sell them).
If you get a chance to try one, I say go for it, but set your expectations low. Very low.