Duke"s Mayonnaise comes in 16-ounce jars. 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. 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 Duke"s kitchen has been replaced by a modern production facility that turns out 240 jars of mayonnaise a minute, but the uniquely Southern recipe for Duke"s Mayonnaise has remained the same.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.