On Aug. 1, 1965, Craig Claiborne held a picnic on Gardiner’s Island that has come to be known as “the grandest picnic of all time.” He invited a pantheon of French chefs to prepare the meal — Pierre Franey, his friend and collaborator, who was then executive chef at Le Pavillon, Roger Fessaguet from La Caravelle, Jean Vergnes from the Colony, Rene Verdon, then chef at the White House, and Jacques Pepin, who had been personal chef for Charles de Gaulle before coming to New York to work for Franey at Le Pavillon.