American humorist Lewis Grizzard (1946-1994) listed several “rules to follow when ordering in an unfamiliar restaurant” in his newspaper column on April 11, 1986. The first rule was:
 
“Never order barbecue in a place that also serves quiche.”
 
Grizzard’s restaurant rule has been frequently reprinted.
 
   
Wikipedia: Lewis Grizzard
Lewis McDonald Grizzard, Jr. (October 20, 1946 – March 20, 1994) was an American writer and humorist, known for his Southern demeanor and commentary on the American South. Although he spent his early career as a newspaper sports writer and editor, becoming the sports editor of the Atlanta Journal at age 23, he is much better known for his humorous newspaper columns in the Atlanta Journal-Constitution. He was also a popular stand-up comedian & lecturer.
 
11 April 1986, Hattiesburg (MS) American, “Travelers should know new restaurant rules” by Lewis Grizzard, pg. 8A, col. 2:
“Because there are several rules to follow when ordering in an unfamiliar restaurant,” I replied and quickly named several of them.
 
1. Never order barbecue in a place that also serves quiche.
2. Never send back food in a place where the cook is wearing a sidearm.
3. Never order anything you can’t pronounce.
4. Never order chili in a place where there is a picture of a camel on the menu.
   
Google Books
Grizzardisms:
The Wit and Wisdom of Lewis Grizzard
By Lewis Grizzard
New York, NY: Random House Incorporated
1995
Pg. 28:
Never order barbecue in a place that also serves quiche.
 
Google Books
The 2,548 Wittiest Things Anybody Ever Said
By Robert Byrne
New York, NY: Touchstone
2012
Pg. ?:
1,051
Never order barbecue in a place that also serves quiche. —Lewis Grizzard (1946–1994)
 
Twitter
Mark Weaver‏
@mbweaver43
“Never order barbecue in a place that also serves quiche.”
Lewis Grizzard
6:19 AM - 19 Mar 2017