"The proof of the pudding . . ."

Hi, could someone please tell me the orgin of this phrase and its ealiest use?

Thank You! :)

The old saying goes "The proof of the pudding is in the eating." To see previous discussions, type "proof pudding" in the search box on the main Discussion Forum page. I don't know whether we ever traced it back to its earliest use. There's been much discussion of its meaning.