I think you are thinking of a liver flush that calls for olive oil and a lot of lemon. This is the one where the old lady on her last legs walked around all night, supported by her bothers I believe--and never again had gallstone trouble.
Edit: no--I stand corrected, as I said. actually, I love lemons. probably go through two a day at least. Since I water fasted, they taste very complex: delicious to me. lots of layers of flavour I never noticed before.