Almost A Century After Eugenia Duke Created Her Unique Mayonnaise Recipe, Duke’S Is Still Made In Greenville, South Carolina. Mrs. Duke’S Kitchen Has Been Replaced By A Modern Production Facility That Turns Out 240 Jars Of Mayonnaise A Minute, But The Uniquely Southern Recipe For Duke’S Mayonnaise Has Remained The Same. ”We’Ve Never Changed The Formula,” Explains Mark Sauer, Vice President Of Sales For C.F. Sauer And Great-Grandson Of Conrad Sauer, Sr. Try Duke’S Light Mayonnaise In All Of Your Favorite Recipes And Sandwiches And Get The Same Delicious Duke’S Flavor With Only Half The Fat And Calories.