it's almost worth the trouble:

"The third way is when in an assumed body he presents himself as being something which he is not; as witness the story which S. Gregory tells in his First Dialogue of a Nun, who ate a lettuce, which, however, as the devil confessed, was not a lettuce, but the devil in the form of a lettuce, or in the lettuce itself." (Q.9. Malleus Maleficarum.)