“Culture eats strategy for breakfast.”
According to The Quote Investigator, this phrase first appeared on PIMA’s North American Papermaker: The Official Publication of the Paper Industry Management Association, in an article by Bill Moore and Jerry Rose. The year was 2000. Since then, the phrase has appeared many times. Peter Drucker died in 2005. The first time his name was associated to the citation was on 2011. Other occurrences and versions of the phrase can be found at https://quoteinvestigator.com/2017/05/23/culture-eats/
Misattributed
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Peter F. Drucker 180
American business consultant 1909–2005Related quotes

“I like sex for breakfast, kid. I eat early and often.”
Source: Iced

“To eat well in England, you should have a breakfast three times a day.”
Quoted in Somerset Maugham (1980) by Ted Morgan

“I am that one person
Who eats his breakfast,
Gazing at morning nothing.”
Classical Japanese Database, Translation #174 http://carlsensei.com/classical/index.php/translation/view/174 (Translation: Reginald Horace Blyth)
Individual poems
Original: (ja) 朝顔に
我は飯食ふ
男かな
Original: (ja) asagao ni
ware wa meshi kû
otoko kana

“Rambo was a Green Beret," Hannah said. "Please. We eat those army boys for breakfast.”
Source: Lord of Misrule

“I kidnap children from bathrooms
I eat the children for breakfast
They were so young
Yum Yum Yum”
The Chanukah Song.