From the excellent Toilet of Flora:
Okay. Just as long as I never, ever have to find out what boiling urine smells like.
Anyway; although it wasn't easy finding one single recipe that didn't include horse dung, white lead, endangered species or ox-gall (N.B. not necessarily together), I finally managed to dig out not only one but TWO recipes that I will try at the end of the month. Stay tuned.