http://www.digitaltrends.com/international/japanese-scientists-creates-meat-out-of-feces/
When researcher Mitsuyuki Ikeda was approached by Tokyo Sewage about "SEWAGE MUD" and implored him to explore the possibilites, Ikeda found that the "MUD" contained a vast amount of protein due to all the bacteria
So he and his fellow researchers extracted the protein and created an artificial steak (with a little bit of Soy protein for flavor).
Thankfully due to cost of all the research involved, we won't be seeing this on the store shelves anytime soon
Now please pardon me whilest I go hurl my ever loving guts out