Question

A good ole slice of pumpkin pie is quintessential Thanksgiving dining. But in which recipe book did it first appear?

Answer 1

The answer is Le Vrai Cuisinier Francois.

The recipe book that pumpkin pie first appeared in was Le Vrai Cuisinier Francois in 1651. The meaning of the name of the book is The True French Cook, and it was authored by the famous author and chef Francois Pierre la Varenne. A couple of years later, in 1653, the book was translated and published in English in England as the French Cook.

Answer 2

The correct answer of your question is "Le Vrai Cuisinier Francois". 
This was the first book which was published in the year 1651  and contain the recipe of Pumpkin pie. The book was written by  the "Francois Pierre la Varenne" who was also the chef. This book was also translated in to   english and the english version contain name "french cook". Later years sees the many recipe books containing pumpkin pie recipe  like the "The queen like closet" written by famous "Hannah Wooley"