Answer: The majority of euphorbias (also referred to as spurge) are extremely toxic and not commonly used; in fact many people suffer a severe skin reaction from contacting its sap alone. For a historical look at uses for some types of euphorbia you might find the old fashioned herbal by M. Grieves interesting. See the listing for Caper spurge at http://www.botanical.com/botanical/mgmh/s/spurge84.html for her description of its uses. However, I would strongly advise against eating it in any way, shape or form!
Q&A Library Searching Tips