One day two missionaries meet up together. One says to the other, "I can't get my missionaries tasty enough. I've tried grilling them, baking them, I've tried every sort of marinade, but they never seem to be tender!" 

"What missionaries to you use?" asks the second.

"Oh, just those ones that dress in brown robes. They are almost bald except for a halo of hair and spend lots of time down by the river." 

"Oh, no wonder you can't get them tasty enough!" cries the second, "Those are friars!"