Others here have written lengthy and lyrical paeans to this book, so I will try to be brief. It is a masterful book, no doubt about it. Originally published in 1970, "The French Menu Cookbook" reflects a level of sophistication -- and of authentic French sensibility -- that could not be found anywhere else, "Mastering the Art" included, back in the day. Many of the seasonal menus are precisely what one would have at a family gathering or a good solid bistro "over there" -- take, for example, one of the "informal spring dinners":
Filets de Sardines Crues en Marinade
Grillade de Boeuf, Marchand de Vin
Gratin de Pommes de Terre
Salade des Champs
Fromages
Tarte aux Pommes
And of course there are the formal menus, with foie gras, truffles, lobster, pheasant and sauteed cepes.
All along the way, there is Olney's elegant prose. The essay on wine that spans perhaps thirty pages is the most readable, comprehensive and succinct review of basic principles of wine making and service, and of the key French varietals and appellations, I believe I have ever seen. A lot of knowledge and instinct is distilled in these few pages.
This book, which preceded "Simple French Food" by a few years, is more the traditional "cookbook" with reasonably detailed recipes, unlike the Olney masterwork "Simple" that followed it. I still think "Simple French Food" is his crowning achievement, because as my review of "Simple" indicates, it is a book of general principles and a guide to improvisation, not a "recipe book" at all. If you spend a lot of time with "Simple," you will learn to make your own recipes and compose your own menus because it encourages you to riff in the kitchen, to work on your own chops.
But with "Menu," you have a very detailed roadmap -- start to finish menus, recipes and pitch-perfect wine suggestions for each course. It's all good. But to me, by distilling it all down to first principles in "Simple French Food," Olney really climbed the mountain. Perhaps my preference for "Simple" is just because it was the book I came to first -- I bought "Simple" in 1977, used it over and over and over again, and bought my first (and still my only) copy of "Menu" when the revised hardcover edition from David R. Godine came out in 1985.
Whichever of the two books you may regard more highly, both of them belong on every serious food and wine lover's bookshelf.