Old Sour is a sauce, ingredient, and salad dressing used in the Bahamas and Key West, Florida. [1] [2] Old Sour sauce originated in the Bahamas, and is most often prepared using Key lime juice, salt, and bird peppers. [1] [2] Historically, in both Key West and the Caribbean, it was also prepared using sour oranges. [3] The sauce may have been developed to preserve both lime and orange juice for use out of season or off-shore. [4]
Old Sour is most popularly made from an aged (fermented) mixture of Key lime juice, bird peppers, and salt. [5] [6] Old Sour has a salty and acidic flavor. [5] It is notably prepared using a glass or non-metal bowl so as to prevent the citrus flavor from taking on a "metallic" taste. [7] Hot sauce is sometimes used to add additional flavor. [8] [9]
In traditional Key West cooking, Old Sour is used for a variety of dishes including seafood, fried foods, and Key lime pie. [4] [10]