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 Duke's kitchen has been replaced by a modern production facility that turns out 240 jars of mayonnaise a minute, but the uniquely Southern recipe for Duke's Mayonnaise has remained the same.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