There's of course the other "meat": insects.
"Because they are cold-blooded, insects are very efficient at converting feed into protein (crickets, for example, need 12 times less feed than cattle, four times less feed than sheep, and half as much feed as pigs and broiler chickens to produce the same amount of protein)."[0]
I'm plenty squeamish but might just be willing to try mealworm flour. Other ideas: http://news.nationalgeographic.com/news/2013/13/130514-edibl...