Key limes, grown in Florida, are smaller and rounder than the common, more familiar green--or Persian--limes, and their color is more yellow than green. Although Key limes are less widely available than the common lime, bottled Key lime juice is generally available. Either lime works well in this recipe.
If you like your Key lime pie to have a green color instead of the characteristic yellow, beat in a few drops green food color with the condensed milk.
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