key limes

Key limes (Citrus aurantifolia), also known as Mexican limes or West Indian limes, are small, round citrus fruits native to Southeast Asia but historically cultivated in the Florida Keys, which lent them their common name. These limes are significantly smaller than Persian limes—typically 1 to 1.5 inches in diameter—with thin, yellow-green skin and a highly aromatic, pale yellow flesh. The fruit is characteristically seedy, with 8-12 large seeds occupying substantial interior space. Key limes possess a more intensely acidic and aromatic flavor profile than larger lime varieties, with distinctive floral and slightly bitter notes alongside their pronounced tartness. The thin skin and small size make them impractical for large-scale commercial cultivation, resulting in their relative scarcity outside specialized markets.

Key limes are essential to Caribbean and Latin American cuisines, most famously in the preparation of Key lime pie, the official state pie of Florida. The juice is valued for its complex aromatic quality and intense acidity, making it ideal for marinades, ceviche, and cocktails such as daiquiris and margaritas. The whole fruit can be juiced for beverages, preserved as juice concentrate, or used in baking and confectionery. In Southeast Asian cooking, particularly Thai cuisine, key limes (sometimes called calamansi's cousin) are used fresh in curries, dipping sauces, and soups for their distinctive flavor. The thin skin allows for easy juicing by hand-squeezing, and the fruit's aromatic quality intensifies dishes where brightness and complexity of citrus flavor is desired.