“What’s the coolest vegetable?”/“A rad-ish.”

A radish is not necessarily “rad” (as in “radical”), but there’s a riddle:
 
Q: What’s the coolest vegetable?
A: A rad-ish.
 
The joke has been cited in print since at least 2006.
 
“What’s the coldest vegetable?”/“Arctichoke./ Brrroccoli./ Chili pepper./ Chilly pepper./ Cucumbrrr./ Iceberg lettuce” is a somewhat related riddle.
 
 
Sumo Nova
Original Family Friendly Jokes About Vegetables
September 27, 2006 by Editor
(...)
Q: What’s the coolest vegetable?
A: A rad-ish!
 
Veggie Tales Review
Giggles, Groans, and Guffaws…
20 Jun 2008 by JazzRaspberry
(...)
Q: What’s the coolest vegetable?
A: A rad-ish!
   
Twitter
Andrew
‏@affectation
@whompingwillows What’s the coolest vegetable? \m/ RAD \m/ ishes!
11:06 PM - 30 Oct 2010
 
Twitter
Bj Bingham
‏@bjbingham
RT @ThePinkBeanie: The Radish is by far the coolest vegetable. So Rad… ish.
6:56 PM - 14 Nov 2010
 
Fruit and Veggie Jokes (Noember 26, 2010)
Q: What’s the coolest vegetable?
A: A rad-ish!
   
Google Groups: Let’s Grow! School Gardens Learning Community
Farm and Garden Jokes
Lauren Danner
5/10/13
(...)
What’s the coolest vegetable? A rad-ish!
 
Google Books
Belly Laugh Jokes for Kids:
350 Hilarious Jokes
By Sky Pony Editors
New York, NY: Sky Pony Press
2015
Pg. ?:
Q: What is the coolest vegetable?
A: Radishes.
 
Twitter
Fruits & Veggies
‏@Fruits_Veggies
What’s the coolest vegetable? A Rad-ish! LOL! #HealthyHumor #FridayFunny #TGIF
2:01 PM - 26 Aug 2016