Sorry, but if you’ve ever used that phrase you’ve got it all wrong — the real saying is “The proof of the pudding is in the eating.” I guess guilty parties can take small consolation in the fact that they’re not alone. The phrase gets botched all the time — I even noticed it on a WordPress help page today (http://wordpress.com/vip-hosting/). Read more about the phrase and it’s misuse in a Herald Tribune article.
Let’s hope this phrase doesn’t follow the same path as “begging the question,” another phrase so universally misused that the misuse is now acceptable and even in the dictionary. Hint: the original meaning does not mean “raising the question.”