You may have forgotten that the James Bond movie franchise first appeared in novel format. That’s why I included it here but it could easily be under Movies as well.
In short, Ian Fleming, the author of the novels and short stories featuring Bond … James Bond … otherwise known as 007 … preferred his martinis “shaken not stirred” because “he believed it preserved the flavor of the drink”.
Along the way, Fleming invented the ” Vesper Martini”, which he revealed in Casino Royale.
Three measures of Gordon’s, one of vodka, half a measure of Kina Lillet. Shake it very well until it’s ice-cold, then add a large thin slice of lemon peel…This drink’s my own invention. I’m going to patent it when I think of a good name.” Later, in chapter 8, Bond names the drink Vesper after the beautiful Vesper Lynde, a character who was apparently based on a real Polish agent named Krystyna Skarbek, who was working for Special Operations Executive. [Novel Suspects]
I’ve never heard of “KinaLillet”, a French apertif discontinued in the 1960s, but you can find a suggested alternative here.