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 Duke’S Kitchen Has Been Replaced By A Modern Production Facility That Turns Out 240 Jars Of Mayonnaise A Minute, But The Uniquely Southern Recipe For Duke’S Mayonnaise Has Remained The Same.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. Enjoy The Smooth, Creamy And One-Of-A Kind Flavor Of Duke’S Mayonnaise In Your Coleslaw, Potato, Egg And Tuna Salads, Deviled Eggs And Dips As Well As On Your Favorite Sandwiches