If I were asked to name the greatest of all regional American desserts, my answer might very well be Key lime pie, a sweet that is difficult for most people to make authentically. The real McCoy must be made with genuine Key limes of the sort found in the Florida Keys and the surrounding territory or on most islands in the Caribbean. You can make it with the commonplace, store-bought Persian limes, but they lack the pungent, tart flavor of the Key limes. It is one of the simplest of pies to make, whatever juice you have at your disposal.
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