Old sour is a
sauce used in
the Bahamas and
Key West, Florida.[1][2] Old sour sauce originated in the Bahamas, and was originally prepared using key lime juice, salt and
bird peppers.[1][2] It is made from an aged (
fermented) mixture of
lime (fruit)juice and
salt.[3][4] Old Sour has a salty and acidic flavor.[3]Hot sauce is sometimes used to add additional flavor.[5][6]Conchs, natives of Key West, use the sauce for a variety of food including seafood dishes.[7] The sauce may have been developed to preserve lime juice.[7]