So far as I know, the oldest in the English language at least, is Banting's Letter on Corpulence. Having lost weight and dramatically improved his health on a low carbohydrate diet. Banting wrote and self-published the book back in the Mid-Victorian era, and he distributed it for free.
Read More »Lesson #33: Asparagus Omelet
The Asparagus Omelet in tonight's menu fulfills both requirements for me, and it has another plus: any time I have asparagus I feel rich. There's something about asparagus that always spells ""extravagance"" to me.
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