Good idea. I wouldn't mind seeing

--Fredo's recipe for goose (he did cook his own, after all)
--Nazorine's recipe for wedding cake
--The recipe for Hyman Roth's birthday cake
--Vincent't recipe for gnocchis
--The recipe for Clemenza's favorite cannolis
--The recipe for the chopped liver, served on Ritz crackers at Anthony's commuunion party.

And the dinner menus for

--Hagen's dinner with Jack Woltz.
--Michael's dinner in Vegas ("The chef, he cooked for you special") after the meeting with Moe Green.
--The dinner Connie prepared for Carlo that he wasn't hungry for.
--The Chinese takeout meal, shared by Sonny, Tom, Michael, Clemenza, Tessio, and an unidentified individual (who some think is Rocco, but isn't), while waiting for word on where the Sollozzo meeting was to take place.