“Where can you learn how to make ice cream?” (joke)

“Sundae”/“Sunday” is included in a popular pun:
 
Q: Where can you learn how to make ice cream?
A: Sundae school.

 
The joke has been cited in print since at least 2001-02.
 
   
Google Groups: alt.humor.dutch.terrace
? ? ??
WebMeester
10/24/01
(...)
Where does Ice Cream go to school? Answer: Sundae School.
 

Google Groups: alt.humor.puns
Puns of the Weak 11/15/02
Stan Kegel
11/15/02
(...)
Where can you learn to make ice cream?
In sundae school! (Sophie, 9)
 
Google Groups: alt.humor.puns
Puns of the Weak 04-18-03
Stan Kegel
4/18/03
(...)
Where can you learn to make ice cream?
In sundae school! (Sophie, 9 )
 
Google Books
School Jokes
By Joseph Rosenbloom
New York, NY: Sterling Publishing Company, Inc.
2003
Pg. 4:
Where do you go to learn how to make ice cream?
Sundae school.
   
Google Books
Penguin Pocket Jokes
By David Pickering
New York, NY: Penguin Books
2006
Pg. ?:
Where can you learn how to make ice cream?
Sundae school.
 
Google News Archive
11 June 2006, The Ledger (Lakeland, FL), pg. D10, col. 6:
Jumble Answer
Where to learn how to make ice cream dishes—AT SUNDAE SCHOOL.
 
Twitter
Shaysteele
‏@Shaysteele
Wut do cheerleaders like to drink wit there lunch? .....root beer! Haha! Where do u learn how to make ice cream? ...... Sunday school!
11:01 AM - 17 Sep 2008
 
Twitter
Jen Hudspeth
‏@Jen_Hud
Q: Where does a person go to school to learn how to make ice cream?
A: Sundae School! #lamejokesthatmakemelaugh
10:02 PM - 13 Jun 2009
 
Twitter
OutLoudLaughing
‏@OutLoudLaughing
Short funny jokes-Learn to make Ice cream: Where would you learn to make ice cream?At sundae school. http://bit.ly/9Qvusy
9:41 PM - 28 Jul 2010
 
Google Books
Chuckle Squad:
Jokes about Classrooms, Sports, Food, Teachers, and Other School Subjects

By Michael Dahl
Mankato, MN: Picture Window Books
2011
Pg. ?:
Where’s the best place to learn how to make ice cream?
At sundae school.
   
Google Books
Horrid Henry’s Jumbo Joke Book (3-in-1)
By Francesca Simon
London: Hachette Children’s Group
2015
Pg. ?:
Where do you learn how to make ice cream?
Sundae school.