| Duff, Johnnycake, Pequin pepper|Old Sour Wikipedia
Old Sour is a sauce used in Key West, Florida and the Bahamas. It is made from an aged (fermented) mixture lime (fruit) juice and salt. Old Sour has a salty and acidic flavor. It can be made with Bird pepper, chile peppers, and hot sauce to add additional kick. Conchs, natives of Key West use the sauce for a variety of food including to flavor seafood dishes. The sauce may have been developed to preserve lime juice.