I once heard a rumor about the Japanese creating artifical meat from feces and sewege sludge! Since they don't have much space to raise cattle (although their Kobe beef is one of the world's finest!) and their people ask for more meat, they look for every opportunity there is to come up with a solution. And one Japanese scientist claimed that feces and sewege sludge still carry some nutrition and can be recycled in a way that they are edible again and somehow tatste like meat. I mean: Yuck! Just the pure thought makes me want to vomit. So food from leftovers might not be so bad after all...
A Finnish future vision video has some interesting concepts, including a Star Trek machine that is used to create fine dining from leftovers:
What do you think? Would you EAT that?