proof is in the pudding.

i never quit understood that lol but i still use it

ok i had to goolge it lol

According to Bartlett's Familiar Quotations, the phrase dates back to at least 1615 when Miguel de Cervantes published Don Quixote. In this comic novel, the phrase is stated as, "The proof of the pudding is the eating."

These days, some people shorten the phrase to simply "proof of the pudding." Even the American Heritage Dictionary of the English Language trims it down. Occasionally, it is even further abbreviated to "proof in pudding," irritating purists who argue that the shortened versions don't mean anything on their own. Let's just hope it doesn't get further reduced any time soon. "Proofpudding" just doesn't cut it.
Where does the phrase "the proof is in the pudding" come from?

Ok i am not the only person puzzled. see what you learn at B&G

"The proof of the pudding is the eating."