I'm trying to discover where a particular quote comes from.  My
brother states it is either a movie or a TV show episode wherein
school-age kids are discussing the lunch being served in the
cafeteria.  They describe it as some kind of "mystery meat" and a
"blue vegetable" (though not necessarily in that order).

Hi aaronpb-ga,

Thanks for your question. I received an email from the Google Answers
team indicating that my comment below is indeed the answer to your
question.

I'm pleased to have found the correct identification for you.

"Better Off Dead" directed by Savage Steve Holland in 1985is probably
the quintessential 80s film (and it's one of my personal favorites).
The movie starred John Cusack, David Ogden Stiers and Kim Darby.

IMDB: Better Off Dead
http://us.imdb.com/Title?0088794

There are several scenes set in the school cafeteria (including the
one where Cusack decides to approach the rollerskating girl who dates
the entire basketball team--at the same time), but the one that sticks
out in my mind (and specifically involves blue food)takes place in
John Cusack character's home, where his culinarily-challenged mother
serves boiled and blue bacon to David Ogden Stiers.

Some links about the movie:
Better Off Dead
http://www.chud.com/chudvd/reviews/betteroffdead.php3

Better Off Dead
http://www.geocities.com/TelevisionCity/3998/betteroff.html

Better Off Dead
http://www.canadiandvdgroup.com/reviews/betteroffdead.htm

Search strategy:
Google search:
"better off dead"
"better off dead" blue

If you need additional information, please ask for clarification and
I'll be happy to assist you.

Regards,
luciaphile-ga

Thank you so much for answering this question.  I asked it on behalf
of my brother, who has been looking for the source of this quote for
years.  I am so impressed and very appreciative that you answered our
question.

Well... This is from Meatballs 
"Attention. Here's an update on tonight's dinner. It was veal. I
repeat, veal. The winner of tonight's MYSTERY MEAT contest is Jeffrey
Corbin who guessed "some kind of beef."

I looked for awhile and couldn't find anything about blue vegetables..

Yes. I remember this from Meatballs, The Movie.

Might it have been from a 80's/90's Nickelodeon show called "Salute
Your Shorts"?
I remember many episodes mentioning mystery meat in a "cafeteria" (a
camp pavillion for serving lunches).

Mention of the "Mystery Meat"
http://www.public.iastate.edu/~spires/Camp/guestbook3.html


If you know the decade or year when this show/movie came out it could
help in locating it.

It's not from "Better Off Dead" is it?