Len Deighton has written many ace spy stories. It's a little less known that he wrote a number of innovative and brilliant cook books. First published in 1965 by Penguin (of course), Ou Est Le Garlic features Deighton's own "cookstrips" that illustrate basic French home cooking techniques, processes and dishes. It's not surprising to learn, when you see them, that the man had worked as a graphic artist and his strips had been featured in the London Observer before being published in book form.
How appropriate that the cover was designed by a French man, Jacques Dehornois, in Paris. Although not the prettiest design when viewed today, I really admire it; trying hard as it does to look like the window of an authentic French bistro rather than a book.
Related trivia I know about Deighton:
In my favourite film of all time, The Ipcress File, you can see Deighton's cookstrips pinned to a post in Harry Palmer's kitchenette and when Palmer seduces Courtney with his culinery prowess and cracks an egg into his frying pan with one hand, Caine was unable to do it so the hand you see is in fact Deightons.