“How was the hamburger murdered?”/“First it was ‘rolled,’ then smothered in onions.”

A hamburger riddle is:
 
Q: How was the hamburger murdered?
A: First it was “rolled,” then smothered in onions.
 
The joke was printed in the book 101 Hamburger Jokes: Meaty Jokes to be Devoured with Relish (1978).
 
           
Google Books
101 Hamburger Jokes:
Meaty Jokes to be Devoured with Relish
By Phil Hirsch
New York, NY: Scholastic, Incorporated
1978
Pg. 28:
How was the hamburger murdered?
First it was “rolled,” then smothered in onions.
 
29 April 1986, Philadelphia (PA) Daily News, “Share-a-Joke,” pg. 52, col. 2:
Question: How was the hamburger murdered!
Answer: First it was rolled, then it was smothered with onions.
 
Twitter
KristynBrittney
@KristynBrittney
How was the hamburger murdered? First it was ‘rolled,’ then smothered in onions
1:54 AM - 24 Oct 2009
     
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
“How was the hamburger murdered? First it was ‘rolled,’ then smothered in onions”
 
Twitter
lorraine Jo King
@LahLahBean
#badjokethursday
How was the hamburger murdered?
First it was ‘rolled,’ then smothered in onions
1:29 AM - 12 Jul 2018